Think of this as a prologue to some upcoming posts on evidence – including a more structured discussion of the evidence we’ve obtained over the years and my take on broader issues of evidence and the ivorybill controversy. Look for those at the end of this month and in July. There’s likely to be a trip report posted before then. I’m also planning a postscript to the Bits ‘n’ Pieces series that summarizes my thoughts in a more organized fashion. That will come sometime this summer. In addition, we will have trail cam imagery from seven deployments (plus unreviewed imagery from five cards) to examine over the summer. We’ll be adding an eighth camera later this month, targeting some scaling Tommy found last month. As discussed previously, we plan to leave these cameras in place for the foreseeable future.
In the meantime, I thought I’d share the details about and accompanying photographs related to two sightings Frank had in the old search area during the summer and fall of 2009, before my first visit. But first, I’d like to share a trail cam image from the location and deployment where we obtained a suggestive trail cam image a week after I had a possible sighting. With the passage of time, I had forgotten that the landowner’s grandsons (who are mentioned in one set of Frank’s notes) had reported seeing an ivorybill in the same immediate vicinity on the morning when Frank and I had an auditory encounter, and the day before my possible sighting.
This image below was captured in 2009, the day after the one mentioned above that we published years ago. The bird is in flight, just below the fork and to the left of the scaled trunk. I’ll leave it to readers to evaluate; I don’t know what it is, but I think the wing pattern is intriguing. You can click on this image (and the others) to view them in a larger format.
With regard to trail cam photos, this is a processed detail from another image from 2009 that Frank liked for ivorybill and that he may have posted on ibwo.net back in 2009 or 2010. I was initially intrigued by this image but was eventually convinced that it shows a Pileated Woodpecker with somewhat worn feathers and that the apparent long tail is due to the posture of the bird. It was a rare time when Frank and I agreed to disagree about an ivorybill related matter. I remain convinced the bird is a Pileated and won’t be including this in my planned discussion of our evidence, but I’m posting it here because Frank had such a strong opinion about it.
In summer and fall 2009, before my first visit to the property, Frank had two sightings in the course of which he obtained several photographs. These images are inconclusive at best, and the late Bill Pulliam had a critical take on the two Frank took during the first encounter. I’ll include the bulk of Bill’s analysis below; his commentary notwithstanding, I think these images are worthy of posting now. In retrospect, they are among the very few such images that have been obtained in conjunction with a sighting and with accompanying field notes. The context in which they were obtained, in a small area where there were multiple sightings and auditory encounters by multiple people over a period of six months, gives these notes and images added weight, in my view. I’m grateful to Amanda Wiley Legendre for giving me the go-ahead to post this material. All photos and field notes are by Frank Wiley
Here are screen caps of Frank’s handwritten notes (with a minor redaction to protect location information). The photographs follow.
Bill Pulliam compared the images with others showing the background without the bird present. This is what he had to say:
First Image: I’m actually having a very hard time making sense of this one. What I get as bird is the three large white areas, the small black spot between them, and a reddish or yellowish mass to the lower left. From the context of the two images thus would seem to be a side view of a bird flying to the left and somewhat away. At a glance it almost looks like a bird with a white body, white wings, dark on the breast, and rusty red head. In the absence of any other information, I would think it is some sort of duck except I’m not sure how to make the colors match up. The reddish blob to the left really does look like the head of a duck flying to the left.
I can’t reconcile this with a woodpecker of any kind, or with the description you provided. It might be a molting young little blue heron or white ibis, I suppose. It really kinda looks like a canvasback, except this is august, right? Even if I disregard the red head, I don’t see how to line it up sensibly.
Second Image: This one is even more problematic. There are the two white arcs that look like wings, but then there is a long narrow dark extension to their left. This time the foreground object comes out to be: I don’t know WHAT this might be. If I disregard the long thing to the left it might be something with white wings, but it’s hard to say more than that.
In summary — I can’t make sense of these objects to have any idea what to call them; the first one is not easy to reconcile with Ivorybill, the second is just hard to say anything about. Given that they are actually the same object, I’m still at a loss.
Sorry, not what you want to hear, but it’s what I come up with. Bill
In reading Bill’s comments for the first time in years, nearly a decade after he wrote them, I’m struck more by how perplexing he found the images to be than by his coming up with something I didn’t want to hear. I am also struck the level of detail in Frank’s description, which I also hadn’t looked at since he wrote it or shortly thereafter.
It’s worth bearing in mind that these photographs were taken with a mid-range, consumer 2008 DSLR with a very modest burst mode. It’s to Frank’s immense credit that he got any pictures at all under the circumstances; the same goes double for the next series.
This is Frank’s account of his November 8, 2009 sighting, which he wrote up in Word, again with a few redactions unrelated to the substance of the report. This was approximately a half mile from the camera trap location. Note that I don’t have copies of all the images Frank used in the figures below, so I’ve taken screen captures from the Word document. The images I do have are reproduced in full size at bottom.
Figure 1: Overview map of sighting area
On 11-08-09, Frank Wiley at approximately 7:30am CST was on speakerphone with Mark Michaels of New York. During the time we were on the phone I was approximately 1000 yards Southwest of the location shown in Figure 1 above. During that time while I had Mark on speakerphone, he heard several possible double raps (though over the phone he could not separate the individual raps), and at least one very loud single rap that he remarked upon as being very distinct and woody. These sound detections were quite loud to me, as the observer on the scene, and were obviously loud enough to be picked up at a considerable distance by the speakerphone microphone in my Blackberry. I had my Sony IC recorder running nearby at the time, but have not yet reviewed the recording to determine which (if any) of the putative sound detections it may have picked up.
During the time we were connected, Mark was able to make out calls of Pileated Woodpeckers, a Yellow Shafted Flicker, and Red Bellied Woodpeckers, as well as numerous other bird calls. Additionally, I identified by sight a number of other woodpeckers including 2 Downy Woodpeckers, a Yellow Shafted Flicker, numerous Red Bellied Woodpeckers, numerous Pileated Woodpeckers, 1 Hairy Woodpecker and a pair of Yellow Bellied Sapsuckers. Photos of all (time and date tagged) are available for review, except no photo of the Yellow Shafted Flicker.
Note: I do not have copies of the photos or the audio recording referenced above.
At one point, I stated to Mark that I was possibly being approached by an ivorybill. A black and white bird with the apparent giss of a large woodpecker was approaching my position. Before the bird reached me, it was mobbed by a small (3 or 4 birds) murder of crows, and fled to the North. The unknown woodpecker appeared slightly larger than a Pileated, but was slimmer in profile with seemingly longer wings. Its flight did not undulate as a Pileated normally would. I cannot ascribe any field marks to this bird that would definitively identify it as a Pileated or any other species of large woodpecker, so obviously, Pileated Woodpecker cannot be ruled out in this instance.
After the forest quieted down, I got off the phone with Mark, and staked out a small finger lake in the area for a couple of hours. Woodpecker activity remained higher than usual in the area, especially the Red Bellied and Pileated Woodpeckers. During this time, I heard some loud “hammering” that had a pop…POP-pop sequence coming from across the lake, at a distance I would estimate to be greater than 150 yds.
Slightly before noon I walked out of the forest to the home of a member of the family, that owns this tract of forest. I visited with him and his wife until their son M (14) and nephew B (14) returned from their morning squirrel hunt. As I planned to deploy a game camera, and having had one stolen a couple of weeks before, the boys had hooked a trailer to their ATV, and were hauling a caving ladder so I could strap the camera to a tree 10-12 feet off the ground to deter theft and meddling.
We were on the ATV (B riding on the trailer, M driving, and I was riding behind him) and headed to the spot where I planned to deploy the camera (in the forest approximately 100 yds West of the tree circled in Figure 1). Immediately after crossing the slough shown on the Southern portion of the map, B began pounding my back and shouting “There goes the bird!”
Though young, B and M have spent their lives in the woods. They have keen eyesight, and are becoming quite adept at identification of the larger birds common to the area by sight and sound. I have repeatedly tested them with Pileated visual and auditory contacts with “Is THAT the bird?” and they never claim that a Pileated is “the bird.” “The bird” we are discussing is the Ivory-billed Woodpecker.
M and I looked in the direction (North/Northeast). B was pointing and sighted the bird at approximately 275 yards, flying just above the canopy West to East. The bird did not “swoop” or “undulate” in the manner of most woodpeckers, and displayed distinct white plumage on both the dorsal and ventral secondary flight feathers. The bird’s giss was more slender, and longer, with a longer seeming tail than a normal Pileated. I quickly raised my camera and snapped off three quick shots. While the bird was definitely in the frame, I had bumped my focusing dial, and it was not focused at infinity for the zoom setting. Upon review, these three frames reveal nothing but blur, but have been retained for my records. This occurred at 1:38pm CST (2:38pm CDT on the camera). The bird then banked to its left (North) and disappeared from view.
M restarted the ATV and began moving North, when approximately 1 minute later, B shouted “There’s one on the side of that tree!” indicating a large pecan in the Northwest corner of the clearing. Both M and I looked up as three large black and white woodpeckers with trailing white secondary dorsal flight feathers flushed from the side of the tree. I am quite sure of our identification of these birds as Ivory-billed Woodpeckers.
Even though the range was extreme (later measured at approximately 225 yards), I raised my camera again (prefocused to infinity this time) and got off four shots of a bird fleeing to our left (West). These photos, Figures 2 thru 9, appear below. Figure 2, 3, 4, and 5 are the pictures as seen in the original file reduced for insertion into this document. Figure 6, 7, 8, and 9 are cropped and zoomed at the same pixel rate and resized for insertion into this document. In my opinion, except for the long tail, and odd wing shape, Figures 6 and 7 look somewhat like a crow. Figure 8 is apparently a large woodpecker with wings in a “tucked” position. Figure 9 is the same bird with the wings in an upward position. In both Figure 8 and 9, a long, substantial bill appears to be present. In Figure 9, the bird’s right wing shows possible white along the trailing edge in the location of the secondary flight feathers.
Again, the fact that he was able to get any photographs at all is a reflection of Frank’s skills, which he had honed as a hunter. And while these photographs are inconclusive, the description of what he observed lends them considerable weight in my view.
Here are the frames that I still have on my computer. A couple are processed and cropped somewhat differently. One includes an annotation that Frank omitted from the report, highlighting an American Robin to provide a sense of scale. It may be helpful to examine these higher resolution versions.
Last year, a reader requested that I post some personal reminiscences about Frank. I didn’t get around to doing it then but thought I’d offer something on this sad anniversary.
Frank and I met through the Ivorybill Researchers’ Forum (www.ibwo.net) in the fall of 2008. I made my first trip to search with him in Louisiana shortly thereafter. Our collaboration gelled in the summer of 2009 when he began to visit our old search area. I visited him again in November 2009. In January 2010, I came up with the name Project Coyote as a play on his name and to reflect his central role in the effort.
On the surface, Frank and I were probably as different as the worlds in which we grew up. Frank was one of the smartest, most paradoxical people I’ve ever known. He was a very well-read autodidact whose writing style was deceptively at odds with the way he presented himself – as a stone cold, 2nd amendment loving, libertarian redneck, albeit a nerdy math, physics, sci-fi, and Star Trek loving one. I’m a very liberal New Yorker of Jewish ancestry with degrees in law and American Studies.
Despite our differences, we found more common ground politically than I could have anticipated, and he’d sometimes say, “Don’t tell anyone I said this, but . . .” We shared a distaste for spectator sports and also found common ground musically. Though he loved Pink Floyd first and foremost, and I grew up in the ’70s Punk scene, we both enjoyed rootsier genres, and some of our most enjoyable, non-field times involved tequila and singing together. Frank was a good singer and gifted all-around musician; I managed to harmonize decently on background vocals. The Stones’ “Dead Flowers” was a favorite.
But what really united us was the ivorybill, and more specifically, a shared sense that figuring out what J.J. Kuhn knew was the key to documenting the bird.
While there are echoes of the Tanner-Kuhn dynamic in our story – at least to the extent that, like Tanner, I’m from New York, with a graduate degree from an Ivy League school, and Frank, like Kuhn, was from Louisiana with no formal academic training – we were doing something different. We were equal partners, trying to solve a mystery together, bringing different, complementary skills to the effort.
Still, when we were approached about the possibility of doing a reality show (I’m thankful every day that didn’t happen), I described us as “the odd couple of the ivorybill world”. In retrospect, the oddness was more superficial than substantial; we may not have been the only such pair; and odd may be commonplace when it comes to the ivorybill. In any case, I miss my friend, our shared dedication to the search, the music, and our many running jokes – especially the ones about stump holes and the ubiquitous Plate 11.
I returned to the main Project Coyote search area where I spent December 27-January 1. I was joined by two new team members – Erik Hendrickson, an excellent birder and retired National Park Service engineer who had an ivorybill sighting in Arkansas back in 2005, and Jay Tischendorf, a veterinarian with a long and adventure-filled background as a field biologist. Erik lives in Colorado, so he may not be able to visit often, but Jay is much closer. I hope that both of them will be able to return and bring their considerable skills to the effort.
Stephen Pagans, who has been with Project Coyote since 2012, was in the area for the duration. Steve is a retired forester, avid birder with a great ear, and an outstanding photographer. This portrait of a feral hog (more on hogs later), which I think is award-worthy, is just one example of his work.
Tom Foti made it down from Arkansas for a day. Spending time in the woods with Tom, whose knowledge of bottomland forests is second to none, is always an education. On this trip, Tom pointed out that I’d been mistaken about the hickories in the search area. I believed that they were all bitternut hickories (Carya cordiformis), except for a very few shagbarks (Carya ovata), but it turns out that many, perhaps the majority, are in fact pignut hickories (Carya glabra). One of these, shown below, has a DBH of 42″ and may be a state champion. Tom also identified a nutmeg hickory (Carya myristicaeformis), an uncommon species that may not have been previously recorded in the parish.
Having such great companions for the week caused me to look back at the past year, with its terrible low points – the losses of Frank and Bill Pulliam – and high points, particularly the March recordings, which I think are among the strongest evidence of ivorybill persistence obtained to date, and to appreciate my friends, collaborators, and outside advisors. Although I’ve been the public face of Project Coyote for years (Frank wanted it that way), this has always been a team effort, although the composition of the group has shifted over time. While it would be cumbersome to name everyone involved and some frequent advisers prefer to remain anonymous, there are several, in addition to those mentioned above, whom I’d like to acknowledge publicly.
On more than one occasion over the years, Bob Ford has lifted my spirits when they most needed lifting. When I talked to Bob shortly before Frank’s death, I was despondent. I knew Frank’s prognosis was not good and was having doubts about carrying on. Bob helped me see a way forward, reminding me that the search area is important, ivorybills or no ivorybills, and that I’d done meaningful work related to its ecology in general.
Matt Courtman, who had some involvement early on and had known Frank for several years, reached out shortly after Frank died, giving me much needed moral and intellectual support and breathing new life into Project Coyote. In one of those odd coincidences, Matt’s New York relatives knew and did business with my father decades ago.
Philip Vanbergen, the youngest among us, had the presence of mind to turn on his recording device on March 11 and capture a couple of calls, setting the stage for his and Matt’s return on the 15th when the much longer recordings were made. Phil has also been responsible for our trail cams since 2016. His energy, enthusiasm, and interest in the natural history of the area are invaluable.
Peggy Shrum’s ideas, background studying raptors in the Peruvian rainforest (a considerably more challenging environment), and familiarity with tropical Campephilus double knocks are great assets. Peggy has made the long trip from South Carolina to participate several times, and it’s always a pleasure to have her along.
Tommy Michot and Wylie Barrow from Lafayette have also been great sources of support. Though Tommy is a retired biologist with a Ph.D, I admire his youthful enthusiasm, open-mindedness, enjoyment of the woods, and his sense of humor. To top it off, he’s also an accomplished traditional Cajun musician from an illustrious musical family. Wylie and Tommy have known each other for years, and while Wylie has seldom been able to make it into the field, his careful, scientific approach and probing questions help keep me on track. While I skipped it on this most recent trip, the lunches I have with Wylie and Tommy (and sometimes Phil) in Lafayette on the way home invariably help me absorb and evaluate whatever I’ve observed or experienced while searching.
Professor Fredrik Bryntesson has been a great online friend and supporter. He has shared details from his research into some arcane aspects of ivorybill history, some of which have found their way onto the blog. I hope we get to meet in person and that he will be able to visit our search area sometime soon.
Finally, Patricia Johnson, my wife – Patricia comes along from time to time, holds down the house when she stays at home. Her moral and morale support sustain me.
Though 2017 was difficult, I’m grateful to be surrounded by such great collaborators. I’m hoping for more highs and fewer lows in the year ahead . . . Without further ado, here’s the trip report. As with the previous one, I’ve opted not to do a day-by-day log. There’s not all that much to report.
The weather this trip ranged from cloudy, dreary, and damp to bitterly cold; there was little sunshine, except on January 1st, and avian activity was generally low throughout. Woodpeckers, except for Red-headeds, were mostly quieter and less active than usual. Nevertheless, on at least one day, we saw or heard all seven species (ivorybill excluded) that are found in the area at this time of year.
Birds may not have been very active, but the hogs certainly were. We saw upwards of 15-20 on a couple of days, and signs of their rooting were everywhere. Their numbers seem to have increased considerably since 2012, despite the presence of at least a few dedicated hunters in the area. We ran across these newborn hogs and assumed their mother had been shot. Their cute appearance belies their destructive potential should they survive.
We did not have any possible ivorybill encounters and found little recent bark scaling, except on two or three sweet gums, some extensive work on a pine, and a small patch on a cypress. Some commentary below the images.
Phil solved the problem with the trail cams, and we now have three deployed on hickories – two that have lost their tops and one that is in obvious decline. We’ll deploy the fourth in the spring when it will be easier to locate unhealthy trees. Given what we’ve observed and the life cycle of the beetles involved, I think scaling on hickories is most likely to take place between mid to late spring and fall.
Fresh scaling on the bole and branches of a recently uprooted sweet gum. Some of the bark chips were large and consistent with what I would expect for Ivory-billed Woodpecker.
With regard to the sweet gum scaling, it is far and away the most abundant form of this work we’ve found, and this has been true year after year. It is considerably more common in the Project Coyote search area than in other places I’ve visited or than in the Pascagoula, based on the Carlisles’ efforts there. It also matches the work described by Tanner as being typical of ivorybill, but as discussed in my post entitled Bark: An Exegesis, sweet gum bark is relatively easy to scale, making it more difficult to exclude Pileated Woodpecker. As an aside, I’m puzzled by the fact that we found a good deal of scaling on oaks in 2012-2013 and have seen virtually none since then.
While I’ve written previously that I think pine has no potential for being a diagnostic because it is easily scaled, the example above impressed me for its extensiveness and the fact that the presence of needles suggests the tree died very recently. Lighting conditions in the field were so poor that it was impossible to see that scattered patches of bark remained. This only became apparent when I brightened the photographs. Even so, the extensiveness so soon after death remains impressive.
I’ve included the beaver-killed cypress scaling here not because I think it’s likely ivorybill work; it could be, but the bark was loose, and the scaled area, while contiguous, covered only a modest percentage of the bole. What may be significant is the presence of insect work of a kind that is suggestive of suitable ivorybill prey. Tanner thought that cypress-tupelo swamps were poor habitats for the ivorybill, presumably because both are long-lived and relatively insect-resistant species and perhaps because he rarely ran across large scale deadenings of those species. The example shown here leads me to wonder about this assumption, particularly in places where beavers are present or other disturbances occur; fire, to which water tupelos are apparently vulnerable, for example. While Allen and Kellogg reported that Florida ivorybills nested in cypress and fed nearby on fire damaged pines, I think it’s possible that food sources would be sufficient in cypress-tupelo swamps under certain conditions. This relates, at least indirectly, to issues that have been addressed in the “Bits and Pieces” series. Stay tuned for the final installment.
My friend and collaborator since 2008. We came from different worlds, brought together and bonded by our passion for the ivorybill and the swamps. I will miss him.
Here’s one more from Phil Vanbergen.
Two weeks ago, Frank went into the hospital. About two days after admission, he was taken to the ICU with a systemic infection. He started showing signs of improvement on Monday this week and was able to go off the ventilator as of yesterday. (I was there from Tuesday 1/24-Tuesday 1/31.) I know Frank to be a fighter, but even so, he’s doing far better than I expected. His family is asking for prayers, so if that’s something you do, it would be appreciated. My thoughts are with him and with them.
To expand on some of the data included toward the end of the March trip report (which is worth reading in in conjunction with this post), I thought it would be informative to provide a season by season and sector by sector breakdown of the scaling I and others involved with Project Coyote have found since the spring of 2012. To do so, I’ve gone through my notes and photographs and have done my best to reconstruct the data collected. While not complete (I’m quite sure a good deal more scaling was found in Sector 3 during 2013-2014, for example), I think this breakdown is a fairly accurate reflection of what we’ve found over the years.
As discussed in previous posts, I think extensive scaling on hickory boles is the most compelling for Ivory-billed Woodpecker. Bark on this species is thick, dense, and usually remains very tight for a long time. Extensive scaling on sweet gum boles and oaks (upper boles and large branches) is second among work that I’ve found. Work on small boles, and higher and smaller branches is somewhat less compelling and is more significant for its abundance. Some of the high branch scaling and work on smaller boled sweet gums may well have been done by Pileated Woodpeckers (and possibly by Hairy Woodpeckers), but the abundance, the presence of large bark chips in many cases, the way it appears in clusters, and the fact that Pileateds scale infrequently suggest a different source for much of it.
I have excluded all work where squirrels are suspected but have counted one tree, a hickory found this year, on which the work could well have been that of a Hairy Woodpecker. Hairies do forage for Cerambycid beetles just under the bark, but they’re only capable of removing tight bark in small pieces; their work on hickories is perhaps more accurately described as excavation through the bark.
The trail cam images toward the end of this post are the best we have (out of many thousands of hours of coverage) showing how these species forage on suspected ivorybill feeding trees.
All trees were live or recently dead (twigs and sometimes leaves attached). All scaling was on live or recently dead wood.
Sweet Gum (Liquidambar styracifula)
Sector 1: 46
Sector 2: 8
Sector 3: 51
~15% had scaling on boles (a few of these were large trees). The majority of work was on crowns, including larger branches. Fallen trees were included when woodpecker involvement was evident and bark was tight.
Bitternut Hickory (Carya cordiformis)
Sector 1: 3
Sector 2: 4
Sector 3: 7
All trees were standing; scaling was on boles and was very extensive (the tree shown on the homepage is one example) with one exception from this year . Insect tunnels were visible in all examples. An additional hickory with a modest amount of high branch scaling was found in Sector 1 this year but was not counted for this analysis.
Oak (Quercus) spp.
Sector 1: 1
Sector 2: 4
Sector 3: 0
All oaks had scaling on large branches; one also had some on the bole. All oaks in Sector 2 were found in a single cluster.
We have some information on forest composition in Sector 3, and it appears that sweet gums make up approximately 19%, oaks upwards of 35%, and hickories somewhere under 10%. Sectors 1 and 2 may differ and be more varied in overall composition.
The overwhelming preference for sweet gums relative to their abundance stands out. The scaled oaks are a mix of species, one Nuttall’s, one willow, the others unidentified.
In Sector 3, I am treating the compact stretch from the location of Frank Wiley’s sighting last spring/downed sweet gum top where we had the camera trap to just south of our current deployment as a cluster. The estimate of 23 trees being found in this area is conservative. I have only found one instance of recent scaling north of the location of the downed limb/Frank’s 2015 sighting. The main cluster has been in the same vicinity this year and last, with additional work scattered around farther south. Two of the hickories are within 30 yards of each other, approximately half a mile from the cluster, and one was on the edge of the concentration.
It also may be significant to note that we found a cluster of old but intriguing cavities in the same vicinity as the Sector 3 concentration in 2013-2014. Most of these seem to have fallen. The difficulty we’re having finding active, suggestive cavities is vexing, and may be the most compelling reason to be skeptical about the presence of ivorybills in the area. At the same time, finding Pileated cavities is difficult, even in defended home ranges.
I’m treating Sector 1 as a single concentration; the vast majority of the work is on a natural levee where sweet gums are abundant. The entire area is considerably larger than the other clusters, but given the abundance and ease with which we’ve found sign there over the last five seasons, I think it constitutes one area of concentration.
In Sector 2, there was a small cluster in the area where I recorded putative kent calls in 2013, with work found in 2012 (spring and fall) and 2013. Because the area is small with open sight lines, I can be confident there has been no recent work there since late in 2013 (I last passed through it with Tom Foti back in March of this year.)
The sweet gum work Tom and I found on that day was perhaps half a mile north of this cluster, within 100 yards of the hickory on the homepage. The other hickories found in the 2013 and 2014 seasons were not far away, no more than 500 yards apart as the crow flies.
There’s obviously some bias here, since there’s a relationship between finding feeding sign in a given area and spending time there. Nevertheless, I have little doubt that the putative ivorybill work tends to be clustered. I also have little doubt about the strong preference for sweet gums, since I’m not looking at tree species when I look for scaling. The degree to which sweet gums are favored has only become clear over the last year or so.
Frank pointed out this data does not reflect most of the scaling that likely exists in relatively close proximity to the Sector 3 cluster but cannot be quantified because it is in an area we have intermittently visited due to inaccessibility. Only two or three examples are from this area, which has been visited a handful of times.
As usual, much of this report will be focused on bark scaling. I found an unprecedented amount of fresh work this trip, a total of 29 trees, all sweet gums. I only counted live and freshly dead trees that appeared to have been scaled within the last year, and probably more recently than that, in most cases. As will be discussed, I was able to ascertain that 11 of these trees had been worked on no earlier than March 15th. I was selective about what I included in the count, relying on my years of experience looking at scaling and how its appearance changes over time and this passage from Tanner for the criteria:
Ivory bill sign shows as bare places on recently dead limbs and trees, where bark has been scaled off clean and to a considerable extent. Pileateds do some scaling too, but it is usually confined to smaller limbs and those longer dead. Freshness of the sign can be judged by any appearance of weathering, which will soon turn bare wood a grayish color. Extensive scaling of the bark from a tree which has died so recently that the bark is still tight, with a brownish or reddish color to the exposed wood showing that the work is fresh, is one good indication of the presence of ivorybills.
We had a number of visitors during my stay. Tom Foti joined me again on Tuesday and Wednesday, and Phil and Eric Vanbergen came along on Friday. I appreciate the Vanbergens’ help in collecting the data I’ll be discussing. It’s great to have such enthusiastic young people involved. Meanwhile, John Williams (Motiheal from ibwo.net) visited and spent four days in the field with Frank. Both John and Frank are planning to provide their own accounts, and those will be posted in the weeks ahead.
A general note about the week, leaf out progressed rapidly, and the change between Sunday the 20th and Saturday the 26th was dramatic. Nonetheless, I was able to find a good deal of feeding sign later in the week.
I arrived on the evening of Saturday, March 19th, and Frank and I spent the 20th in the northern sector. There had been severe flooding in the area earlier in the week; the waters had receded – we suspect by the 15th or 16th and certainly no earlier than the 15th. One of our trail cams, placed about 4’ above the ground, was completely overtopped, ruining the card and probably the camera as well. Such floods are exceedingly rare, perhaps a once in 500 year occurrence in the area. Fortunately, flooding tends to recede rapidly, but crossing both permanent and seasonal water bodies remained a much bigger challenge due to deep water and slick banks. The most stunning aspect of the flooding was the near total scouring of leaf litter in many parts of the search area, leaving bare soil and deposited silt visible. The landscape was transformed, and familiar spots looked radically different.
Frank often describes walking through the forest on dry leaf litter as “walking on cornflakes.” The absence of leaf litter limits the noise made by walking. This may be advantageous between now and late fall. Unfortunately, I anticipate being able to visit the area only once more before summer, probably in June.
The flooding had another benefit this trip. The absence of leaf litter makes it much easier to find fresh bark chips on the ground and to determine with some degree of certainty when scaling has taken place. The flood waters receded no earlier than March 15, so all fresh chips found below trees where the leaf litter had been scoured were no more than a week old.
When we reached the vicinity of the downed top, first discussed here, we heard a loud single knock. Frank’s initial reaction was that it might have been a gunshot, but we both agreed that the sound seemed to have come from a nearby source; we heard no other shots that day and saw only one vehicle, almost 2 miles away. Later in the morning we heard a couple of weak possible double knocks and later a very good sounding one.
We also found a little bit of scaling just north of the northern concentration discussed below. While some of it looked to be quite fresh, we did not find any bark chips.
The scaling in the first of the above photographs is somewhat marginal, as only a single smaller upper limb is involved. While I’m unsure, I don’t think I counted either of these trees, as I only started keeping track later in the week; both examples came from very close to the northern cluster discussed below.
I was on alone on the 20th, and I returned to the same area. I found a good deal more scaling.
In many cases, the scaling shows sign of progressing from treetops down, as Tanner described.
The detail of the small tree, scaled down to where small branches are still in leaf, is at the edge of a small pond around or in which I found five other trees with recent scaling on them, as well as two more with older work (not counted).
There was new work on one of the trees I found last month, the larger one in the background, below. I found several other scaled trees in the immediate vicinity, including the one in the foreground, on which we’ve now deployed a camera, and much of that work was fresh too. I chose a spot for a stakeout and spent about an hour watching the treetops in this area of concentrated work. This location is 140 yards south of the small pond described above and is at the southern boundary of the cluster. During the stakeout, I heard a loud single knock that seemed to have come from the vicinity of the small pond.
As I was leaving, I passed the pond again and found what appeared to be new scaling on one of the trees at its edge. There were fresh chips in floating in the water at the base.
Tom Foti arrived on the morning of the 22nd. We spent the day in the one of the southern areas where we’ve found concentrations of bark scaling in past years and where there have been both possible visual and auditory encounters. We found several scaled trees in this area but did not see or hear anything.
I met up with Tom on the morning of the 23rd; I had decided overnight to be more methodical in my approach to documenting scaling. I’ve been so focused on what might be diagnostic that I haven’t attempted to quantify what I’ve found thus far and haven’t kept detailed location information. Thus, it seems like a good idea to start keeping better track. This should prove useful if we can document that ivorybills are present and that they are responsible for the bark removal.
Tom and I heard 6-8 likely kents at ~9:00 am, this at the downed top where we had the camera, the same location where Frank had his sighting last spring. The calls came from three directions, south, east, and west.
We headed south and met up with Frank and John in the core of the northern concentration, south of the pond. We did an extended playback series; John will have more to say about the specifics in his post. We all heard a nearby double knock during the playback; Tom, John, and I were sitting close together near the speaker and thought it was a single, but Frank, who was positioned closer to the source of the natural sound, called it as a double.
We found some very fresh bark chips (moist with sap) at the base of a 12” DBH dying sweet gum that has areas of scaling high on the bole. The tree (which is shown above) is only a few meters from the one found last month. We’ve deployed a camera aimed at this bole. Given the quantity of activity in the area and the evidence of return visits to feeding trees, we hope to get some hits before long.
We removed a piece of bark from a looser spot on a nearby downed tree (which had been fed on by woodpeckers both before and after it fell). Beneath the bark were Cerambycid larvae, pupae that I also suspect are also Cerambycids, and what I think may be a very young Elaterid larva. We placed some of these larvae and pupae on the piece of bark to illustrate. We suspect that Allen did the same for what became Plate 10 in Tanner.
On the way out and not far from the cluster, I spotted what appears to be the start of a large, irregularly shaped cavity. We’ll monitor this and see whether there’s any further excavation.
It rained heavily on the morning of the 24th. I spent part of the afternoon trying to take measurements but didn’t have much success, since I was using an ordinary tape measure.
On the 25th, Phil and Eric Vanbergen joined me and we took measurements in the two areas where there are concentrations of scaling, finding several more trees in the process. When I got back to Frank’s, the forester’s DBH measuring tape I ordered had arrived, making it possible for me to take measurements on my own.
I spent the 26th measuring suspected feeding trees in the southern area and found several more with recent work on them.
Except for feeding sign, I did not see or hear anything suggestive of ivorybills during my last three days in the area.
Now I’ll turn to some of the data I collected this week.
I counted 29 suspected recent feeding trees in the two areas, 13 in the northern sector and 16 in the southern. I did not count work that appeared to be more than a year old or work that was limited to very small branches.
The areas are 2.05 miles apart. The northern area was logged (probably partially) in 1905, although there may have been some later selective cutting. The southern area was logged in 1935. Forest composition is somewhat different between the two areas, with sweet gums seeming to be less predominant in the southern one. In the southern area, the scaled trees are in a narrow, almost linear strip with an area of .13 square miles/83.2 acres/33.67 hectares. The northern cluster is more compact and polygonal, with a total area of .03 square miles/19.2 acres/7.7 hectares. Within both areas, scaled trees were often found in groups of 2-6 – 11 out of 13 trees in the northern area and 11 out 16 in the southern. (This includes the cluster in and around the pond, which is perhaps 30 meters in diameter, but otherwise applies to trees that I estimated to be 20 meters apart or less.)
Scaled trees ranged from 6.5” dbh to over 5’ (estimated) for a gum with a split trunk, one stem live and the other dead. All but 3 inaccessible trees were measured.
76% of the trees were alive, sometimes just barely, with scaling on dead or nearly dead limbs or boles. There was scaling on live parts of one or possibly two of the trees.
Though we have found scaling on boles of larger trees in the past, all trees scaled on boles were 12” DBH or less. While these measurements may not be meaningful absent a random sampling of trees in each sector for comparison, I thought the numbers might be of some interest even now, especially in light of the recent discussion of Tanner:
This is obviously a very small sample, but I think it’s interesting nonetheless. The three smallest trees in the northern sector were all in or near a pond that appears to have had its outflow blocked in recent years. They probably died due to the change in hydrology. But for that difference, there seems to be an even greater favoring of 25-36” DBH trees than found by Tanner, and this is so even in the less mature southern sector (again without data on overall composition). This year, feeding sign has been found exclusively on sweet gums. We’ve found a few scaled oaks over the years and more bitternut hickories; I suspect the latter are being fed upon at a high rate relative to abundance. We’ve discussed doing some random sampling for tree size and species, but given our limited resources, this may not be worthwhile or feasible at present.
Of course, none of this proves that ivorybills are in our area, but I think it’s another indication that they are. The best-case scenario is that the dramatic increase in scaling this year and in this season is related to there being young in a nest or nests.
I flew into Houston on February 4 and arrived at the search area on the morning of the 5th. Frank’s work schedule had precluded him from returning to the search area during my absence, and he was unable to get time off to join me this trip.
Tommy Michot visited on the February 5th; we went to the northern sector, and passed the downed sweet gum top (actually a limb) found in April of last year. Project Coyote had a camera trained on it for some time but took it down due to equipment failure. The main stem, which reaches from the ground to about 20 feet up, had been scaled extensively, down to the base, over the course of the last month. Some of the work had been done no more than a few days prior to my arrival based on the condition of bark chips found at the base.
We have a camera back on this top but have low expectations, since so much bark has been removed that it makes a much easier target for other species of woodpecker. While I don’t believe in the “curse of the ivorybill”, individuals and small groups of self-funded searchers face enormous obstacles and are dependent on equipment that’s often unreliable.
Tommy and I measured a number of the largest trees in the area, and the biggest oaks and sweet gums are around 4’ DBH, with many more in the 3’ range. Here are some of the highlights: two Nuttall oaks: 137 cm/53.94”, 119 cm/46.85″; swamp chestnut oak 110 cm/43.31” four sweet gums: 124 cm/48.82”, 123 cm/48.43”, 110 cm/43.31″, 109 cm/42.91”.
While ours was not a random sample, this table from a 1986 paper by Tanner (on data collected in the Singer Tract in 1938), is interesting for the sake of comparison.
In his 1944 report on the Singer Tract, Richard Pough described sweet gums in the 5’-6’ DBH range as being characteristic of old growth conditions, and such trees were not uncommon in the 19th century. Impressionistically, at least, most of the ~4’ DBH sweet gums in our area are moribund and are likely to have lost their tops. I know of only one gum that appears to be in the 5′ DBH category. As of 2009, the national champion sweet gum had a DBH of 5’4.6″. The tree below could be close to that.
Many, perhaps most, gums have at least some beaver damage. This may be contributing to the earlier mortality, both by stressing the trees directly and by creating the opportunity for beetles to infest them. I have long suspected that the decline of the beaver could have contributed to the IBWO’s disappearance, since beavers directly damage trees by gnawing and also stress or kill them by altering hydrology.
Beavers were extirpated from much of Louisiana by the early 19th century. As of 1931, populations were restricted to the Amite and Comite rivers in the southeastern corner of the state; they were reintroduced in other areas in 1938 and had established themselves in 21 parishes as of 1951. (Wylie Barrow, pers. comm.) Range expansion continued into the 1990s and after. They’re now considered a pest animal and appear to be found in all parishes. A recent paper suggests that the introduction of beavers into Magellanic Woodpecker habitat may have benefitted that species.
I was on my own on February 6th, and I went and staked out the downed top for the better part of the morning. Nothing landed on it except for a Red-bellied Woodpecker that pecked and gleaned but did not scale bark or do any excavating. At approximately 9:30, I did a very aggressive series of ADKs. I heard a couple of loud single knocks that seemed to come from no more than a couple of hundred yards away and also a possible double knock. These came during a period when I was standing, moving around, and doing the ADKs, so I did not hear them very well. In addition, there were a few distant gunshots within about 15 minutes after the series, so I’m not very confident about what I heard. (These were the only shots heard all day.) I found some scaling the next day a couple of hundred yards away (discussed below). This gives me some reason to think the SKs were a reaction, not shots. Still I’d place these in the weak possible category.
One highlight of the day was watching a pair of Red-shouldered Hawks in the act of mating.
I returned to the same area on the 7th, with two cameras to deploy. One is aimed at a large sweet gum stub, about 20’ tall and well over 3’ DBH that I found last trip. The top had broken off shortly before my arrival. While it’s not discussed in Tanner, T. Gilbert Pearson, who was the first modern ornithologist to observe the Singer Tract IBWOs, described this type of “stump” as one of the species’ preferred feeding sites. This is a tree on which I found high branch scaling last year, before the top broke off. I expect this to be a long-term deployment.
I also redeployed a camera on the downed top, although we’re not very hopeful about that location, since the scaling is so extensive and the bark has been loosened in many of the remaining unscaled areas.
I walked south for a couple of hundred yards and found very fresh, large bark chips at the foot of a live sweet gum (there were two large gums ~3’ dbh about 10’ apart). There was extensive scaling on live or recently dead high branches of one or both of these trees. Because there had been a major rainstorm and accompanying minor flooding a week before and the chips were mud free, I can be sure the scaling took place after the rain, and since Tommy and I had spent considerable time in the area examining some other nearby scaling two days before, I strongly suspect this work was done on the 6th. I can’t help but wonder whether the possible single knocks came from whatever was doing the scaling; that would be consistent with my immediate impression when I heard them, both in terms of distance and direction. Nonetheless, my confidence level about the SKs is low given the gunfire.
I don’t think the scaling and bark chips are consistent with squirrel; the chips are large and thick and do not show signs of having been chewed off; the ones collected weighed over five pounds.
There was a little excavation and exit tunnel expansion (visible in the first image above) associated with the scaling; and it has the generally clean edges and lack of layered, flaked off appearance around the edges or on the chips. The leaves and gumballs are attached on most of the limbs, indicating that they’re alive or very, very recently dead, so the bark is almost certainly tight. This is about as good as it gets when up-close examination is not an option
I met Tom Foti, who came in from Arkansas, on the morning of the 8th. Winds were high, with gusts approaching 50 mph. We decided it would be unsafe to venture into the woods, so we drove around the edges of the search area looking at the surrounding upland forest, much of which is impressive and mature. Tom is very enthusiastic about the area, ivorybills or not, and we’re hopeful that steps will be taken to protect and manage it appropriately. The car ride was a running lesson on southern forest ecosystems, and as I told Tom, I’ll count myself lucky if I retain 10% of what I learned.
The next morning, the winds had dropped enough to make it safe to head for the swamps, and Tom and I visited the southern sector, an area where we haven’t spent much time lately. As mentioned in some previous posts, there has been a significant uptick in four-wheeler activity in the area, and it’s heartbreaking to see the destruction these callous individuals are causing. Fortunately, the damage is almost entirely limited to the periphery, and the deeper parts of the bottom are unscathed. The habitat types here are somewhat different, and the logging date is more recent, but it remains very impressive. We walked a long way and went to places I had never been, including a lower-lying flat with tree species I haven’t noticed elsewhere – shagbark hickory, bitter pecan, and overcup oak.
We saw no recent feeding sign in any of these areas, except for some older work on a small sweet gum that I described as being about a grade B-.
We then looped back along a different track, passing the spot where I recorded calls in March of 2013 and where we’d had a concentration of feeding sign in 2012 and 2013. We found nothing until we reached a location farther north that is within 100-200 yards of the tree shown on the homepage. Tom spotted a group of trees with bark scaling, some on boles and some on branches. Once again, this was not “grade A” work, but the concentration makes it more interesting than if it were one isolated example. We did not find any chips at the base of the snag that had been scaled on the bole, and the high branch work is not as extensive some.
It’s worth pointing out that on many days, I’ll walk for hours and see nothing and then find either a dramatic example of scaling or a small cluster of it. Tom and I had probably walked 3.5 miles or more before finding this little cluster.
I was on my own again on the 9th, and I opted to go on a death march to retrieve a trail cam from a tree deep in the swamp and proceed north from there. The tree is a large blown down sweetgum discussed and shown here. There was some fresh scaling on it that I suspect was done by a Pileated Woodpecker. There are nearly six weeks of images to go through, so it will take some time before we find out if there were any captures.
As on the previous day, I walked for a couple of hours without seeing or hearing anything suggestive until I got to a part of the area we haven’t visited since last year, perhaps a quarter mile south of the southernmost point Tommy and I had reached earlier in the week. I found old sign, some of which was fresh last winter and some of which was older. I then found some fresh work on two trees in close proximity to one another. Some of the scaling was on a downed tree but was clearly done by a woodpecker, with chips and other characteristics that I consider to be suggestive. Since the chips were caked with mud, the scaling was a little over a week old. The other work was on one high branch, but conditions made it impossible to look for chips.
On the return hike, I found what I’m quite sure is Pileated Woodpecker work on a recently dead or dying hickory. Since we’ve found a number of hickories that we suspect have been scaled by Ivory-billed Woodpeckers, this was an unusual opportunity to do a direct comparison. In my view the work on hickories is the most compelling for ivorybill due to the density and tightness of the bark and the hardness of the wood. There are pronounced differences in the presumed Pileated and suspected ivorybill work on this species.
The work on the homepage is suspected ivorybill. It is extensive, with huge contiguous areas, perhaps 20% of the entire surface, completely stripped, with evidence of bill strikes targeted at exit tunnels. The Pileated work is spotty by comparison. The bark chunks scaled from the tree on the homepage were large, dense, and thick, and there were no pieces of sapwood among them. By contrast, the suspected Pileated work involves very small pieces of bark that appear to have been removed by digging rather than scaling; there were also a few pieces of punky wood among the chips.
The next morning, I drove to the Wetlands and Aquatic Research Center (formerly the National Wetlands Research Center) in Lafayette and met with Wylie Barrow, Heather Baldwin, Tommy Michot, and Philip and Eric Vanbergen. (Two young enthusiasts who will be helping us out.) Frank joined us briefly, and then Wylie, Tommy, the Vanbergens, and I went out to lunch. It was an exciting and thought-provoking day, and the Research Center is an incredible facility. Wylie and Heather shared their comprehensive and in-depth analysis of conditions in the Singer Tract in Tanner’s day. They’ve amassed an array of materials encompassing land records, Civil War era maps, and stereographic aerial photographs. Their research far surpasses my own speculative effort. It covers the finest details – roads, improved and unimproved, snag densities, tree mortality, conditions around roost and nest sites, as well as conditions in other locations where ivorybills were seen. Tom Foti has done complementary research on hydrology, soils, and vegetation.
Their presentation convinced me that I’ve been too hard on Tanner in some respects. There was a little more old growth in the Singer Tract than I had inferred from the Pough report and some of the historical documents. Nonetheless, the characterization of the Tract as a whole as “virgin” forest is somewhat misleading, since over a quarter of it was second growth, and some of it fairly young. Heather and Wylie have graciously given me permission to summarize some of their findings.
When Tanner began his study, 72% of the Singer Tract was old growth. (Tanner estimated it at over 80%.) Logging in 1938 reduced that percentage to 67%. The ridges, which Tanner deemed to be the best ivorybill habitat, were actually the least likely areas to be old growth. (Tom Foti’s analysis also points to a preference for higher, drier locations.) The regrowth percentages for each landform in Tanner’s day are as follows:
Low ridge (23%)
Total on ridges (32%)
Low flat (4%)
Cypress brake (4.5%)
For the most part, the second growth forests were not particularly old, as has been suggested in previous posts. According to Heather, most of these areas only started to regrow in the 1880s and 1890s, “due to consecutive depressions and low cotton prices”. Thus, parts of the Singer Tract were relatively young second growth, and this included one of the ivorybill home ranges and one that Tanner deemed to be “best” – Mack’s Bayou.
The nature of the habitat in the Mack’s Bayou area is immediately apparent from the 1938 aerial photos, which suggest forest conditions that are present in many parts of Louisiana today. Nevertheless, Ivory-billed Woodpeckers nested there in 1934 and 1935, at minimum, and did so successfully at least once. This fact alone refutes the idea that Ivory-billed Woodpeckers are old growth dependent. Heather informs me that there was an abundance of dead and dying trees on the eastern side of the Mack’s Bayou range, due to a fire caused by logging activities. In any event, the home range Tanner delineated in this primarily second growth area is no larger than the home range he delineated around John’s Bayou, which had more mature forest. In fact, the area he designated as “best” for ivorybills around Mack’s Bayou was slightly smaller than its older equivalent near John’s Bayou.
Tanner knew that a significant portion of the Mack’s Bayou home range was not old growth, since his 1941 map shows “old fields” in the heart of it. He seems to have been unaware of the resurgence of cotton growing during the 1870s and 1880s, so he may have overestimated the age of the forest on that basis. I can’t help but wonder if he glossed over the conditions in the Mack’s Bayou range in part for the sake of protecting the Singer Tract and (as Heather suggested) in part based on what he deemed to be best for the birds from a conservation standpoint, an approach that later ossified into a categorical set of beliefs about old-growth dependence.
As I and others have been arguing for years, extensive forest cover, sufficient dead and dying wood, and enough large trees for roosting and nesting are probably the main requirements, even if old growth or near-old growth conditions are optimal.
I plan to return to the search area in late March and have another post or two in mind in the interim.
Careful examination of bark chips found in conjunction with extensive scaling is one of the key elements in our diagnostic gestalt, but “chips”, a term I’ve been using for years, is both inaccurate and too vague for what we believe is being left behind by Ivory-billed Woodpeckers and for differentiating it from the leavings of other animals. Tanner used “pieces” of bark, ranging “from the size of a “silver dollar to the size of “a man’s hand.” A caption from the National Geographic article on the 1935 Allen and Kellogg expedition that refers to “large chunks of bark”. The existing images of these pieces of bark suggest that chunks is the better term.
It’s important to reiterate that this discussion applies only to live and freshly dead hardwoods. Pines slough bark quickly after death. The process is slower in hardwoods, but as decay progresses, the bark loosens considerably, with the rate of loosening depending on species and environmental conditions. Once the bark has loosened sufficiently, PIWOs can and do scale bark extensively, sometimes leaving behind large chips. In the images that follow (from Allen and Kellogg and Tanner), the bark chips ascribed to ivorybills appear to come from considerably longer dead trees than some of the examples we’ve found, but the images are informative.
The small tree shown above, identified as a “dead gum” by the 1935 expedition, appears to be a hackberry or sugarberry not a gum, and a fairly long dead one; the pieces of bark at the base resemble ones we found beneath hackberries or sugarberries in our old search area, some of which were considerably larger (the one below is the largest).
This colorized slide reveals more about the bark at the base of these pines than the black and white print in Tanner (Plate 9).
There’s also this example, (Plate 10 in Tanner), which appears to be in a considerably more advanced state of decay, and presumably looser, than much of the work we find most interesting. I suspect most of the grubs were placed on the chip for illustrative purposes; the caption “Beetle larvae from beneath bark of Nuttall’s oak” is ambiguous as to where the larvae, which appear to be small Cerambycidae, were actually found.
What I think is most salient in Tanner’s description of bark chips is shape not size. In this regard, it seems important to come up with a more specific set of terms to replace the commonly used “chips”. I’d suggest using chunks and slabs for suspected ivorybill work (although smaller pieces of bark may also be present). Pileated bark removal can involve chips, strips, or flakes, the last when they’re doing the layered scaling discussed here and here. I suspect that squirrels remove hardwood bark primarily or exclusively in strips, and of course, their bark removal on cypresses leaves shredded bark hanging from the trees.
Let’s take a closer look at the differences among pieces of bark we have reason to believe were left by squirrels, those we have reason to believe were left behind by Pileated Woodpeckers, and those we suspect were left behind by Ivory-billed Woodpeckers.
I collected a number of bark chips from the tree we know to have been scaled by a squirrel, and while these were removed before our camera trap revealed the source, there’s strong reason to think they too were left behind by squirrels.
Note the uniformly elongated shape and the ragged appearance at the tops and bottoms of these strips of bark. This is not typical of bark that we infer or know to have been removed by woodpeckers, and it’s consistent with chewing, not scaling. The presumed squirrel strips I collected had the following dimensions:
The downed sweet gum from which they had been removed was a fairly young tree, and the bark is much thinner than on more mature ones. These strips were approximately 1/8″ thick. While this is a very small sample, we suspect (along with Houston from IBWO.net) that approximately 3″ is the upper limit for width when a squirrel is doing the bark removal.
Our research and observations suggest that Pileated Woodpeckers have two strategies for removing tight bark; one involves pecking around the edges until they can gradually pry off small pieces, and the other involves scaling away strips, sometimes in layers. Their physical structure precludes them from doing the extensive, clean scaling of tight bark that Tanner associated with ivorybills.
We suspect that this collection of chips, from a honey locust near a known Pileated nest, reflects the range of what the species is capable of doing on a tight-barked hardwood (and honey locust bark is relatively thin). The upper limit appears to be hand size, with many-quarter sized or smaller.
The following are measurements of some fairly typical suspected Pileated strips from a sweet gum:
The strips shown below, suspected Pileated Woodpecker leavings from a high branch, are on the large end of the spectrum for this category of work. The Peterson Guide is 9.5″ x 6.5″. I can’t rule squirrel out completely for these.
Flakes resemble strips, but they are removed in layers, so that reaching the sapwood is a gradual process. Pileated scaling frequently has this appearance, something that seems frequently to be the case with congeners, including the larger-billed Black Woodpecker (Dryocopus martius).
The chunks and slabs we suspect to be ivorybill work are significantly larger and thicker than strips, flakes and chips, although strips and chips may be present in the mix at the base of suspected feeding trees. Chunks are usually more irregular and varied in size and shape, and both chunks and slabs sometimes have what appear to be strike marks from a broad bill.
I kept one of the chunks scaled from the hickory tree on the homepage, a fairly typical example. It is 8.5″x3.5″ and .375″ thick. (It has undoubtedly lost some of its thickness after drying for over two years.)
The sweet gum chunk with the apparent bill mark Frank is holding is 7.5″x3″ and .25″ thick. On mature, thicker barked trees most or all suspected ivorybill chunks, chips, and slabs will have been removed cleanly, all the way down to the sapwood.
This particular bark “chunk” is intriguing on several levels. We have found that markings many describe as “bill marks” are really truncated galleries between the bark and sapwood. Marks made by woodpecker bills are distinctive, but somewhat subtle, and easily overlooked. This chunk actually has two interesting markings – markings that were left by the animal that removed the bark. The first is near the end of my left thumb – my right index finger is pointing toward it. It is about a quarter inch wide, a bit over a half inch long, and three sixteenths of an inch or so thick. The other is a “V” shaped “notch” at the end of the chunk, near the center of the photo. These places look as if they’ve been struck with a chisel – hard enough to rip the bark away from the sapwood/cambium. This suggests that, even though this bark was very tight, very few strikes were required to loosen and remove it. Granted that these marks are bill strikes, this suggests that the bird removing bark is indeed a powerful animal for its size. Back to Mark.
The two preceding examples are on the smaller side for suspected ivorybill work; in the first, the density, tightness, and grain of hickory bark seem to be a limiting factor on size. Some of the larger examples are shown in the Bark Chip Gallery (as are several of the images shown above). A couple of additional examples of larger slabs are below. In the first, the oak was approximately 8 months dead (leaves attached), and the bark was still tight. (The fractured slab was damaged in transit.)
I thought it was important to post the following advance of writing a comprehensive trip report.
On arriving in the search area last week, I found fresh scaling on a downed, recently dead sweet gum. The tree was relatively small, with a DBH of under two feet, and was alongside one of the roads that pass through our search area. There was fresh work on it on subsequent days. I staked it out on Thursday and saw nothing. We placed one of our game cams on it on Friday and retrieved it late Saturday. The trail cam photos showed a squirrel removing the bark fairly extensively. These images are currently in the game cam’s proprietary format, and we’ll post them in the near future.
As is the case with many of these blowdowns, there was also work in the tops that looked very consistent with Tanner’s descriptions of ivorybill scaling, although only on the upper sides of the limbs and branches. What this tells us is that we have to think squirrels are likely responsible for scaling on downed sweet gums and that all possible sign on downed wood should be looked at with a jaundiced eye. It also means that my previous foraging preference analysis has to be revised; we’ve taken that page private at least for the time being.
I did not collect any chips that are unquestionably the work of a squirrel, but I did gather several that I presume to be. They measure:
and thus are all considerably longer than they are wide, stripped with the grain rather than scaled. The edges that go across the grain have a ragged appearance, and since the tree was not mature, the bark is thin and brittle compared to the bark of the mature downed top discussed below.
It’s odd that we only started finding this type of work in abundance in the past year; it doesn’t exactly match the diagnostic criteria I’d articulated earlier, but it comes close in some respects. It has been an unfortunate distraction, since the work on downed trees is much easier to find and photograph than work on the boles or upper branches of standing ones.
There was a little bit of fresh work on the downed sweet gum top found in April, but it was not extensive enough even to show up in the game cam images. There were a few chips on the ground, more like strips than chips, actually, 6′ to 8′ inches long and no more than an inch across at the largest. We’ve had numerous images of squirrels on that top but none showing them scaling bark for a period of more than two months. We got numerous images of squirrels again this time, and also a pair of Pileateds, with a Downy or Hairy (we didn’t examine the frames very closely) literally trailing the PIWOs up the trunk. In any event, there was no way to tell what did the little bit of scaling, or what did the scaling on the upper part of the downed top or the left fork, which had been almost entirely stripped before we got the camera on it. I lean toward this little bit of new work was done by the Pileateds, but either way the chips don’t have the characteristics I associate with suspected ivorybill chips.
I had been planning to do a post refining and being more explicit about the different types of work I’d been ascribing to ivorybills. I still plan to go ahead with this project but will have to do so informed by this new information. I expect to write something later this month, after I’ve posted the trip report.
While squirrels cannot be ruled out for some of the work we’re finding, it seems unlikely that squirrels are doing all of it, especially on the boles of dense-barked, mature trees (like the hickory on the homepage and most of the others shown here) that have numerous cerambycid exit tunnels and on those that are not quite so freshly dead (and therefore don’t offer as much nutritional value). We monitored the tree on the homepage for several months and had no evidence of squirrels removing bark.
Some preliminary thoughts on what I think remains likely ivorybill work:
The chips shown in the bark chip gallery are mostly as large as or larger than an adult man’s hands. Chip size, shape, and density are probably factors that need to be looked at very closely, and perhaps the contrast between a very ragged, gnawed appearance and a cleaner one with apparent bill strikes is another key aspect.
This smashed sapling was clearly not worked on by squirrels, and the little patches of targeted digging on the small limb are highly reminiscent of Magellanic sign I’ve seen in several photographs:
If you zoom in on the image below, you can see that a woodpecker was involved because the tunnels have been expanded slightly and there’s one Magelllanic-looking dig on the smaller limb. This one also has some superficial scratches that could be from a bill:
This work on a dead oak from the old search area remains interesting, because the bark chips were huge (one as big as my forearm) and due to the apparent lateral bill strikes that were evident when additional bark as stripped several months later:
When it comes to high branch scaling, squirrels can do extensive damage, as in this example on a sugar maple. At the same time, some of the high branch work we’re finding shows clear signs of insect infestation and woodpecker involvement, as in this downed sweet gum limb I found on Saturday. The scaling took place before it fell.
In next example, although the scaling has a little bit of the layered appearance we’ve suggested is more characteristic of Pileateds, it’s clear that woodpeckers are involved, since there are a few places where what we presume to be insect tunnels have been expanded.
While I was initially disappointed by this new data point, not only because it compels me not only to reexamine certain aspects of my hypothesis but also because it eliminates the types of targets we’ve thought most promising in terms of obtaining clear trail cam photos, I recognize that this is part of the process. It’s an opportunity to refine the hypothesis and a reminder to observe carefully. Ultimately, I think there’s more room for confusion between squirrel work and what I take to be IBWO work. We can’t help but wonder whether Tanner himself might have been fooled in some instances.