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A Look Back and a Look Ahead: Project Coyote on WWNO, Season’s End, and Future Plans

WWNO just ran a long story on our search effort. You can listen at the link (recommended) and/or read the text. I’ll share some thoughts about it below, but first a brief update.

As April came to an end, Steve Latta, Jay Tischendorf, Tommy Michot, Phil Vanbergen, and I collected the AudioMoths that had been deployed in early March, completing the effort for the season. Jay, Tommy, and Mike Weeks will be returning to attempt some more DNA collection, and Tommy, Mike, and Phil will continue to service the trail cams. But the bulk of the work has come to an end.

We plan to get an earlier start next winter. And on the technical end, the lab is continuing to tweak the software and refine the machine learning; this has taken took a little longer than anticipated. Similarly, the DNA testing protocols are being refined. I don’t have a time frame for when detailed results will be available and can’t offer any information on if, when, and how results will be presented. But work is ongoing, and for next season, we hope that we’ll be able to turn the audio results around rapidly and get actionable information that will lead us to nesting or roosting sites.

To expand on something that’s mentioned near the end of the WWNO piece, I can say that I’ve cursorily reviewed perhaps .5% of the total audio, (from 3 or 4 of the first round deployments, February – early March). Most of this review involved scrolling through sonograms and listening when it seemed appropriate (meaning I likely missed a lot). It gave me greater appreciation for the technical challenges and the potential for false positives, especially when two or three potential confusion species are vocalizing simultaneously. While I have not heard extended bouts of kent-like calls at close range, I have heard more than enough suggestive sounds, both calls and double knocks, to be encouraged.

Changes to Project Coyote are in the works. Among these is a name change, to Project Principalis – to avoid confusion; I hope retaining “Project” will be enough of a reminder of Frank Wiley and the early days of our partnership. But there’s an existing NGO known as Project Coyote that focuses on actual coyotes, so the change is overdue.

It’s also likely that the blog will move to a different site and take on a somewhat different form. In the interim, there will probably be a guest post on Lazarus species by Jay Tischendorf, sometime in the next few weeks, and perhaps another one from me to detail the changes once they’re finalized. These plans are tentative at the moment. Stay tuned.

Hearing the WWNO story was a little disorienting. I’ve done a lot of media over the years, mostly unrelated to the ivorybill. I’ve never been the subject of such an in-depth profile. And I didn’t expect to be so much the focus. This is all about the ivorybill and the habitat, and while I won’t pretend to be above wanting acknowledgement for all my hard work, I am not the story.

I was disappointed that Phil Vanbergen and Matt Courtman, who made the March 2017 recordings and played a major part in bucking me up when my spirits were at their lowest, were not mentioned by name. I pushed for their inclusion as best I could.

Travis Lux, the reporter, first approached me about doing a story on Project Coyote back in 2015. He was just starting his career in radio and was planning to pitch the piece as a freelancer. Travis landed a job in Texas, continued to follow the blog but had otherwise been out of touch until he heard about the AudioMoth deployments, by which time he had returned to Louisiana. When he reached out to me in February, I think we both assumed that the focus of the story would be on the current effort. Apparently, the interest was there for a longer piece.

Listening to it was weird. I think it was the first time I’ve heard Frank’s voice since he died, at least in more than a very brief snippet. That jarring moment aside, four year seems like a lifetime. My thinking about the ivorybill and many of my perspectives have evolved since 2015. Today, I’d be a lot less excited about the bark scaling that’s a focus in the first part of the story than I was then. I’ve refined my scaling hypothesis considerably due to things I learned that year and later. I’ve also gotten more jaded, so I don’t think I’d be quite as overflowing with optimism.

The experience was a little like watching a movie based on a beloved book. The story wasn’t told in quite the way I would have liked; topics that seem important to me were glossed over; but I don’t see it through the eyes of an outsider. Taking that perspective as best I can, I think it was a well-constructed and illuminating piece. I hope you enjoy it too.

Here’s a gallery of photos from the recent trip.

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Project Coyote in the Media

This local publication reached out to me without knowing I was local. I’m interviewed along with Tim Gallagher and Mike Collins. It’s a straightforward, even-handed piece.


Trip Report, March 5-17, 2019


The following trip report is mostly extracted from a post for members of the search team.

I was in the field from March 5-17; others were around before and after. Thanks to the whole team and a couple of guests for their hard work and contributions in the field this trip. We completed the swap out of recording devices in three days, which left a lot of field time afterwards. We were very fortunate in that only one unit was tampered with and only a couple malfunctioned. This is a very low rate of loss for these units.

We continue to have possible encounters in the area, perhaps at a higher rate than in past seasons, though the number of potential observers and time spent in the area has increased this year. And we have gotten some very preliminary results from the first round of deployments.

In addition to the audio deployments, we’re focused on obtaining DNA this season and have been refining the protocol for doing so. On this trip we collected samples from a couple of different forms of feeding sign, one I think is more promising than the other.

Here’s the basic protocol: collect a small quantity of material from places where a woodpecker’s tongue may have been; place it in a vial containing buffer and seal. With luck, genetic material can be obtained from these surfaces, and we can rule in or rule out ivorybill as the source of some kinds of feeding sign.

We also plan to collect samples from the most promising cavities. And are evaluating them following Cornell’s criteria. Cavities are graded:

A: very large cavity in size range of IBWO with irregular oval or rectangular shape (4.0–4.75in [10.2–12.1cm] wide and 5.0– 5.75in [12.7–14.6cm] tall);

B:  cavity larger than typical PIWO cavity but shape is fairly regular, nearly perfect round or oval; or, cavity of irregular shape and within upper size range for PIWO, and lower size range for IBWO (3.5in x 3.7in or [8.8cm x 9.5cm] large PIWO and 4.0in x 5.0in [10.1cm x 12.8cm] small IBWO);

C:  cavity of fairly regular shape, nearly perfect oval or round, in the upper size range for PIWO and lower size range for IBWO. Same dimensions as for B.

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Ivory-billed Woodpecker Cavity (1935 Nest)
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Typical Pileated Woodpecker Cavity

Here are some promising cavities (I’d grade all of them A or high B) I found last trip, plus some we know are being used by other species. I found more cavities this trip than I ever have in the past, mostly because I was paying attention. There’ll be some explanation in the captions. The truth is, no one really knows about cavities; I’ve seen a lot of variation in what PIWOs do; so a lot of this is speculation. I do think scaling or suggestive feeding sign on a tree with a cavity in it may be an indicator, including that the cavity is a former nest.

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Promising cavity, apparently recent

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Promising cavity with a little fresh scaling; however, there were Wood Ducks perched in this tree, which suggests that it may no longer be active.


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Cavities are harder to spot after leaf out. This one looks fairly fresh.

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Older large cavity in cypress stub.

It can be a tough call. The first pair of cavities shown below is being used (and was likely excavated by) Red-bellied Woodpeckers. The size is deceptively large, but the small diameter of the high limb is an indicator.

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The intriguing cavity below was being used as a PIWO roost but would probably have been graded A for its large size and irregular shape. There’s a second, possibly connected, cavity slightly higher and to the the left. Both are oddly shaped. The snag is severely decayed. But again, we have very limited information, so there’s no way to know whether IBWOs might avoid badly decayed snags.

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Regarding feeding sign, extensive scaling on boles, especially of mature trees with tight bark, seems likeliest for Ivory-billed Woodpecker work. Hickories are the highest priority within this category, and we have only found a few such trees over the years. Extensively scaled sweet gums, like the one shown, are worth noting too. A second category, involving smaller sweet gums and branches, is also intriguing. Ambrosia beetles are the prey species involved in this work, which involves extensive stripping and targeted digs into the insect chambers.

In all cases, it’s important to distinguish scaling from shallow excavation with associated bark removal.

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Suspected IBWO hickory chips

The appearance of this work is distinctive. The bark is removed cleanly, and there’s almost no damage to the underlying wood, except for expansion of the exit tunnels on the surface. We hope that DNA can be extracted from these tunnels and that the scaling shown in the first image is fresh enough to be a good candidate. Based on the life-cycle of the beetles involved, I suspect this work is likelier to be found in the latter part of spring and through summer, but keep your eyes open anyway.

We’re finding that Pileateds also feed on hickories and begin by removing bark. They go about it in a different way, however, excavating through the bark and into the sapwood. The appearance of Pileated work on hickories is similar but somewhat different. It tends to be patchier, without less extensive and contiguous bark removal. The chips are smaller, a mix of bark and sapwood, and the appearance of the wood in the areas where bark has been removed is distinctly different, as in the images below.

Extensive scaling on boles of other species is also noteworthy and may have DNA collection potential. There’s more room for overlap between what IBWO and what PIWO might be able to do, since the properties of hickory bark are unique. Look for extensiveness, large to enormous chips, and lack of damage to the underlying wood.

The final category involves sweet gum saplings and small to medium-sized limbs. I have found this distinctive appearing work in only two years, in a small cluster in 2015 and in a single example this season. The bark is extensively, indeed almost entirely, stripped. Chips on the ground should be large. Leaves should be still attached. The beetles’ brood chambers should have been vigorously attacked, and you may see superficial horizontal scratches in the sapwood (not the deeper grooves that used to be mistakenly ascribed to IBWO).

This was a longer trip than usual, and I was wiped out when I got home. We will be returning at the end of April to collect the units. This will mark the end of the deployments for this season, though we will continue to work with the trail cams, with a couple transferred to new locations. I’m hoping to have a guest post from a team member before the next trip.


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Trip Report: February 2019, Multiple Units Deployed

Since we’re now involved in a formal scientific study, I will refrain from posting about possible encounters until the end of the season. Similarly, we will refrain from using attraction methods (playbacks, kent-imitations, ADKs) while the study is ongoing. We will have a steady presence in the area but will endeavor to tread lightly.

The work on deploying the AudioMoth units began on the evening of Thursday, February 7, with an instructional session led by Tessa Rhinehart of the Kitzes Lab. In the course of this session, we decided on protocols for the deployment period to insure that there’s no confusion about the data collected.

The next morning was training day. We set out to do our first round of deployments, with rotating groups of two learning the process. I was a little unnerved when it took us most of the day to hit eight deployment points. Fortunately, the pace picked up considerably over the course of the week.

On Saturday we broke up into teams of two. A journalist joined Steve Latta and me to observe and record the deployment process. This is someone who had interviewed Frank and me and spent time in the field with us a few years ago. News of the ARU deployment renewed his interest in the story, and if all goes well his report will be airing soon. Stay tuned.

Thanks to Tessa Rhinehart – for her clear instructions, for wrangling us all, for braving the challenging conditions. Thanks also to Steve Latta, Matt Courtman, Mike Weeks, Tommy Michot, Phil Vanbergen, and Patricia Johnson for all their efforts. We covered a lot of ground and worked hard to get the job done by mid-day Wednesday. Deployments are effectively completed for the season, with units to be swapped out for review. We have opted not to spread the recording units as thinly as we had originally planned.

I had one especially interesting find, a form of foraging sign I have only seen once before, in a cluster in 2015. It’s unusual, distinctive, and though it’s somewhat outside the category I’ve suggested may be diagnostic, I think it’s likely ivorybill work and have some hope we’ll be able to resolve that question once and for all.

I found a sweet gum limb standing, embedded in the ground. It had fallen recently, as dead leaves and balls were attached; the bark was very tight; and the wood was hard, showing no signs of rot. I found a small cluster of similar work in 2015 (scroll down in both linked posts), but this type of of feeding sign is extremely unusual for the area, and I’ve never seen it anywhere else.

In 2015, I was able to identify an invasive ambrosia beetle (a tiny Scolytid) as the source of the infestation. Sweet gum is one of the main host species, and infestation, which can kill limbs and saplings but not larger trees, has become increasingly common

The chunks of bark on the ground included the largest ones I’ve ever seen from a sweet gum, the one Steve is holding below, in particular. We have documented Pileateds removing bark from sweet gums, but never in pieces approaching this size or as extensively when bark is thick and tight. While this type of work is somewhat different from what I’ve hypothesized may be diagnostic for ivorybill, I suspect that IBWO is responsible for it. We’re hoping to be able to test the samples Steve collected for DNA, so stay tuned for that.

The only close-up of ivorybill excavation is in Tanner’s dissertation, showing some small holes in a hackberry. I see a similarity between that work and some of these digs.

Ivorybill excavation in a sugar berry, from Tanner’s dissertation. Courtesy of the Division of Rare and Manuscript Collections, Cornell University Library

I found one especially intriguing older cavity in a sweet gum snag this trip. The shape is unusual; it seems to be an expanded knothole. The same appears to have been true of the 1935 nest cavity. The fact that this cavity is surrounded by a scaled area makes it especially interesting, though it may well be disused.

Unusual cavity in sweet gum, with scaling.


Brief Update on Another Area

Before meeting up with the team on February 7th, I spent the morning of the 6th in the vicinity of the Saucier sighting. It seemed a fitting way to remember Frank, a year and a day after his passing. As has been the case in a number of prior visits, large cavities and bark scaling are easy to find, though the scaling was not as suggestive as the best examples from our main search area.

I’m planning another post related to trail cam deployments before long.


An Exciting New Search Strategy and Two Newly Noted Calls from March 2017

Exciting news on the search front, and we’re indebted to Matt Courtman for making this happen. It is a dream come true for me, and I hope it will represent a major breakthrough in the search effort.

This post is going live on the second anniversary of Frank Wiley’s passing. I imagine that he would be as thrilled as I am about this new development.

 Matt recently reached out to the National Aviary, which is collaborating with the Kitzes Lab at the University of Pittsburgh on a variety of acoustic monitoring studies. As a result of Matt’s efforts, Pitt and the Aviary will be supplying us with 200 remote recording units, as well as technical support and processing of the data collected.

The technology has advanced considerably since the organized ivorybill searches in the early 2000s.

We plan to start deploying the units toward the end of the week, with the hope that we’ll be able to home in on potential nest/roost sites in our primary search area. Barring that, we hope the data collected will at minimum provide insight into the movements of putative ivorybills in the area. In addition, we’ll be deploying units in a number of other Louisiana locations.

In other acoustical news, Guy Luneau, whose acute hearing and outstanding ear-birding ability continue to impress, listened to the compilation clip discussed in the previous post and heard something that, to the best of my knowledge, everyone had missed. I know I had.

There are two calls toward the end of that clip (at around 2:25) that sound very similar to the “wonka-wonkas” or “wonks” (as Guy calls them to make it clear the sounds are single syllables) calls from the ’35 recordings. They’re soft, the first softer than the second, but they can be heard on headphones and both show up on the sonogram, the first very faintly. They occur approximately 3 seconds into this 16 second clip.

Several kent-like calls and two lower-pitched notes suggestive of Ivory-billed Woodpecker

I’ve extracted a relevant segment and created a sonogram using Sonic Visualizer. I have also included a bit of a sonogram from the Singer Tract showing both kents and wonka-wonkas. (The relevant segments can be found at 0:57 and 3:14 on the Allen and Kellogg recordings.) Note the smaller harmonic interval (distance between each horizontal line) in the wonkas as compared to the kents. Also note that the wonkas frequently came in pairs, with the first note considerably shorter than the second.

The two calls are at the left of the screen cap. The similar harmonic structure suggests to me that the source is the same creature. I think it also tends to further support the suggestion that these calls were made by ivorybills and tends to exclude other species.

Spectrogram showing two lower-pitched calls suggestive of the Singer Tract “wonka-wonka” calls at far left. Kent-like calls are visible farther to the right.
Sonogram of a segment from 1935 showing wonka-wonka calls on the left and kents on the right.

Brief Update and A March 2017 Compilation

Compilation of Calls and Knocks from Matt’s March 2017 Recording

I had reason to listen to this clip yesterday and realized that I’ve not previously posted it. It includes amplified selections, greatest hits, from the March 2017 recordings – numerous calls and some knocks, including several in apparent response to Matt’s banging with wooden blocks. At this point, I’m not even sure who made it, probably Steve Pagans. In any case, it’s worth a listen, especially if you haven’t heard the recordings before. Headphones aren’t a must, but they’ll help.

The calls are not a perfect match for the known ivorybill sounds recorded in the Singer Tract, but they are similar in many ways. They are also consistent with historical descriptions of ivorybill calls. They do not seem to match any known North American animal. The fact that the suggestive calls and knocks occurred during the same event lends further weight to the idea that Ivory-billed Woodpeckers are the source of the sounds (which seemed to come from more than one source).

Similar sounds are heard rarely in the area, and we have recorded some. The events of mid-March were unique, however, in that the calls were heard in the same location on multiple days, and on the morning of March 15, they continued for hours and numbered in the hundreds. Since that time Matt recorded three calls in April 2018 and Guy, Jay, and I heard similar sounds on New Year’s Day this year.

We are gearing up for a more intensive search effort as the season heads toward its peak. More about that in upcoming reports, so stay tuned.


Yamp-Yamp-Yamp: Trip Report, 12/28/18-1/4/19 (Approximately)

This trip had its ups and downs, including a couple of possible encounters on New Year’s day (discussed below). Weather and accompanying high water posed major problems. Flooding was unprecedented in my experience, and much of the core search area was inaccessible. With three inches of rain predicted for my last two field days, I cut my stay short and went to New Orleans to avoid possible flooding, catch up on some work, and for a little R&R (and chaos).

There were also technical problems – trouble navigating a new camera and my recording device (a replacement for one lost in the field last trip). I’ve included a few of my own photos, though they are not up to my usual standard for posting. The vast majority are courtesy of Erik Hendrickson.

I was in the field from December 29-January 1, as was Jay Tischendorf. Erik arrived the day before and remained until January 4. We were joined by our newest team members – MW, Louisiana-based photographer, who has been doing great work surveying the area and surroundings, developing a more comprehensive picture than I have been able to manage, and Guy Luneau, who arrived on December 31 and was making his first visit to the search area. Guy is a very accomplished birder with great hearing and a deep knowledge of bird calls, especially those of the southeastern US.

It was unnerving to discover that some upland areas have been marked for logging, down to the very edge of the core search area, and within perhaps fifty yards of the location where the March 2017 recordings were made.

Border of upland area marked for logging
27″ DBH pine marked for cutting.

High water was a major obstacle. On New Year’s day, Guy and I wore chest waders, but it became apparent, within about 20 yards after leaving the uplands, that water would be over our heads in some of the sloughs. I’ve never seen conditions like this in the area. Click on an image in the gallery to see them the full-size photos.

On Saturday, December 29, Jay, Erik, MW and I tried to reach the northern group of trail cams. After entering the bottoms, crossing on the log shown above, we were able to reach the northernmost of the cameras but were unable to go more than about 100 yards beyond it. I’ve reviewed the card; there was no new woodpecker activity and a couple of very brief squirrel visits to the scaled patches. There was no observable change to those surfaces.

On the 30th, seeking higher, dryer ground, we visited an upland area in the floodplain of a small stream. This is a patch I’ve wanted to explore for some time, since our logging history map shows an entry date of 1910. As is the case in areas where pine has been cut, stumps from the pre-chainsaw era were scattered around. The forest is not terribly impressive, probably due to soil conditions. There were few dead and dying hardwoods, but we saw several patches of recently dead and debarked pines.

MW departed and Guy Luneau joined us on the morning of New Year’s Eve. We tried an alternate route to the unserviced northern cams. This required a much longer traverse of upland areas, including a large parcel marked for cutting (the blue tagging on the trees shown above is one boundary of the area to be logged). Unlike the other plot, where the larger trees are being taken, this appeared to be more of a thinning operation. It is still unnerving, and there seems to have been an uptick in logging operations in areas that I believed to be protected.

When we got to the bottomland, near the location of the March 2017 recordings, we found it completely flooded and were unable to enter, let alone get anywhere near the cameras. Although we’ve been careful to deploy cameras near head height whenever possible, I suspect that we’ve lost several, possibly as many as 6 of our 8 functioning units, to the flooding. Team members will be returning to check on the cameras within the next couple of weeks.

All the excitement took place on New Year’s Day. There had been a little break in the rain, and we hoped to reach the southern cluster of trail cameras. It soon became clear that this would be impossible. In the southern area, the bottom is considerably wider than where the other cameras are deployed. Here too, water reached the edge of the uplands, and the first slough, which can usually be crossed in ankle-high boots, was completely out of its banks, with water crotch deep approximately 20 yards from where the edge should have been. We messed around on the edges of the bottoms for a while, but found no entry points. At a little after ten, we decided to do a double knock series.

As was the case for most of the trip, woodpecker activity was lower than normal, and double knocks were less productive of responses from other species than is usually the case. As a result, I did a fairly aggressive series over a five minute period. About 15 minutes after I finished, Erik and I, who were standing and positioned somewhat closer to the sound, heard a distinct single knock – clearly a blow to a woody substrate and not an industrial sound or gunshot – at an estimated distance of 300 yards. (I said 300 yards or more; Erik said 300.) The sound was isolated and not associated with foraging knocks or other woodpecker drums. Unfortunately, I thought my recorder was running at the time, but such was not the case.

Stymied at this location, we returned to our vehicles to see if we might be able to reach the bottoms by a different route. We were able to do so, and to walk along a higher stream bank, penetrating a mile or so into the core habitat before an uncrossable slough blocked our progress. At around 1:30 pm, we were walking downstream on the bank, when Guy stopped us, having heard some interesting calls. Jay heard them next, a little less well. I was the last in our party to hear them, and they were at the very edge of my hearing.

We attempted some Blue Jay playbacks and also some playbacks of the March 2017 recordings (using an iPhone without external speaker). Neither produced a response. And we noted no Blue Jays calling at the time.

In the discussion that followed, it became clear that two sources were involved. Guy said that, while they did not sound like the Singer Tract kents, they were somewhat similar to the calls we recorded in March 2017 and were unlike any Blue Jay he had ever heard. Jay agreed that they did not sound like a Blue Jay. I thought I noted what I describe as a creaky quality that I associate with Blue Jays, but I heard the calls least well, can’t be sure, and trust Guy’s ear more than my own. Regardless, the descriptions of the calls are what I find most interesting.

On the spot, Jay gave “Yamp-Yamp-Yamp” as a transliteration of the sounds. This transliteration appears in the literature and is rather obscure. While it is mentioned by Steinberg, Jay was unaware of that reference or its source, George Lowery, who used it in his Louisiana Birds, now out-of-print.

More on “Yamp” as a transliteration below. Suffice it to say that the variability among transliterations and descriptions of ivorybill sounds, including but not limited to “kent” and “yamp”, is indicative of a considerably broader range in pitch and duration than the Singer Tract recordings and the strict parameters used by Cornell in Arkansas would suggest.

Guy, too, used a variant of “yamp” to describe the sounds, as shown in these excerpts from his field notes:

The documentation that I wrote down for myself on what we heard on the afternoon of 1/1/19 was “a whining, nasal, rising yaaAMP, yaaAMP, yaaAMP, yaaAMP.”  I think in my renditions on-the-spot I was verbalizing “waaANK, waaANK,…”.  

Nasal” was my own word, not having remembered (or known) anyone having used the term in days gone by in reference to ivorybill calls. I am curious as to whether any of our forebears have also described a rising inflection in any ivorybill calls. The kents I heard from the Arkansas bird in October 2005 did not have a rising inflection.  They were the sharp single kents and a few double kents (the doubles being HIGH-low) with a tin trumpet quality, distinctly different from what we heard on 1/1/19.


I have never heard before in my life what we heard on that afternoon.  There were no archival matches.  I think you could probably tell by my expression and reaction that I was stumped in North America for the first time in a very very long time. A couple decades, I’d say.

I’m aware of a reference to Lester Short using “yamp” in discussions about the Cuban ivorybill, but as far as I know, the published references all come from Lowery’s Singer Tract observations. Interestingly, Frank used it too, in our first email exchange.

Here are several descriptions from Lowery:

    “The birds were feeding energetically on dead stumps and low trees, and were calling frequently with their peculiar, nasal, rather high-pitched yaamp-yaamp until finally disturbed, after which they retreated to the taller timber and were lost from sight.”

 John S. Campbell, J. J. Kuhn, George H. Lowery Sr., George H. Lowery, Jr., “Bird-Lore’s thirty-fourth Christmas census (Tallulah, La.).” Bird-Lore 36 (1934): 55. 

Through the woods came the loud clear, high-pitched, “yaamp-yaamp,” unmistakably the call notes of the ivory-billed woodpecker.

Its notes are clear and distinct, and yet rather plaintive. They may be heard at a considerable distance, perhaps a half mile, and have been likened to the false high notes of a clarinet or a ten-penny horn. From my experience I would not say that the notes are repeated any definite number of times in succession. As mentioned before, the notes can be described as a monosyllabic “yaamp-yaamp” with a decided nasal twang.

George Lowery, Jr., “The Ivory-billed Woodpecker in Louisiana.” The Proceedings of the Louisiana Academy of Sciences 2, (1935): 84-86.

. . . our ears strained for only one sound – the high-pitched, nasal yamp, yamp, or as some people interpret it, kent, kent of an ivorybill.

(3) a high-pitched nasal call note that may be described as yamp, yamp, yamp instead of a flicker like, deep voiced, cuck, cuck, cuck.

George Lowery, Jr., Louisiana Birds (1955), 415-419.

I don’t think Frank had read Steinberg when he wrote this in fall 2008, and I’m almost certain he was unfamiliar with Lowery’s book, which was long out of print by then. Frank was a musician and had an excellent ear.

Odd you should mention “yank”…Sounded more like “yamp” to me…very first sighting in 93-94 bird made noise like that twice. When told that to ******** LA Natural Heritage Foundation, he said not IBWO and bye now….Have heard similar sounds in HZ…Have some recorded…Will not make you listen unless you ask;-)…

Frank Wiley, October 2008.

I don’t recall what became of those recordings but it’s intriguing that this little-known transliteration has been used more than once to describe sounds heard in Louisiana.

I’ve heard many stories like Frank’s. He was remained annoyed by his treatment over the “93-’94” bird and talked about it often. The incident illustrates how easy it is for local reports to die in desk drawers and how only a limited number of them reach those who keep track of such things. Several years after Frank sent that email, we met the official; he had no memory of the incident.

It’s always encouraging to have possible auditory contacts, which are infrequent but which often seem to come in clusters. Nevertheless, I’ve become somewhat jaded and tend to minimize their importance. Guy and Jay (for whom it was the first possible encounter) were a lot more excited than I, but for my part, I can safely say that I always enter the habitat with some hope but very low expectations. Every possible encounter is a surprise.

Finally, here are some of Erik’s pictures from the trip, and three of mine, including his first Red-cockaded Woodpecker captures.



Season’s Greetings and Singer Tract Conditions Revisited

Wishing everyone happy holidays and the best for 2019. While the blog has been quiet for a couple of months, the effort continues. A number of items are in the works, and I hope to have news about them in the coming months. And of course, I hope to be able to report on new encounters and new data. My long promised discussion of evidence and the standards applied to the ivorybill is still very much on my mind, but I’m not sure when I’ll be ready to tackle it here; the subject is complicated.

Meanwhile, I thought I’d repost the final section of a trip report posted in late winter 2016, for the benefit of new readers and those who might have missed it then. In retrospect, I buried some very important material at the end of a long post dealing with other matters. I think this content deserves more attention, since it is definitive with regard to conditions in the Singer Tract when Tanner was conducting his study and is more useful in that regard than either Tanner’s statements or Richard Pough’s report, which took issue with some of those statements and perhaps overstated the case in the other direction.

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:

Ridge (43%)

Low ridge (23%)

Total on ridges (32%)

Flat (9%)

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.

 


More Squirrels and No Scaling on a Mature Sweetgum

I have reviewed the entire late August-late October card and some of the June-August card for what we’ve designated as deployment 5 – a three-years dead Sweetgum stub discussed last summer. Based on approximately six months of data from this deployment, I think squirrels can be excluded as the source of extensive bark removal from mature, thick-barked hardwood boles, just as the data suggest that Pileated Woodpecker can be excluded as the source of scaling on hickories.

The only potential sources of the extensive bark removal under discussion are gray or fox squirrel, Pileated Woodpecker, and Ivory-billed Woodpecker. Pileated Woodpeckers appear to be unable to remove large quantities of bark from hickories in large pieces, and squirrels appear to be unable to do so on the weaker, thinner-barked sweetgums. Based on trail cam captures obtained thus far, Ivory-billed Woodpecker is the likeliest source for the extensive bark-scaling on hickories that we’ve found infrequently in our search area and that I’ve hypothesized is diagnostic for that species.

There were no woodpecker hits on this target tree, but there are multiple sequences involving squirrels. There was minimal little bark removal, and only from previously scaled areas. In fact, I have only detected one visible change to the bark. A small quantity was removed on June 9, between 11:44:13 and 11:44:33. This is shown in the details below.

Squirrels were active on this scaled patch over the course of the deployment, but whatever removed the small strip of bark on the lower right did so during that 20-second interval and was not captured on the trail camera. I think a woodpecker of some sort is probable, since a squirrel would likely have been visible on the trunk in preceding or subsequent frames.

More importantly, squirrels were captured on or around the scaled areas on multiple occasions, and the captures shed light the way they interact with bark on standing boles and what may limit their capacity to remove it.

This deployment ran from August 19-October 21. Squirrels were detected on 17 days and on or near the scaled surfaces on at least 6 of those days. As previously documented, squirrels displayed interest in the edges of the scaling and frequently appeared to be gnawing; however, they removed little or no bark. We now have numerous captures of squirrels on target boles, both scaled and unscaled, and no captures showing them removing bark in quantity or in anything other than small strips.

Squirrels are clearly capable of rapidly and efficiently removing bark from limbs, downed trees, and thinner barked boles. However, I think there are physical limits – body structure and incisor length – on their capacity to remove thick bark from standing boles.

The following images and time lapse clips show what squirrels do when confronted with thicker bark and suggest that when hanging onto a standing trunk, they lack the leverage to remove bark quickly and leave large pieces behind. This should apparent in the selection of stills and video clips shown below as well as in the sequences posted previously. (A brief discussion of squirrels on hickories follows the images.)

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Up to now, I have not been differentiating among squirrel hits on targeted trees, squirrel hits on or near scaled surfaces, and squirrel hits in other parts of the frame. Suffice it to say there many, far more than woodpecker hits on both sweet gums and hickories. Squirrels frequently show an interest in the scaled surfaces and also in other damaged areas (like the fracture in the hickory bark shown below). To date we have no examples of squirrels removing any bark from hickories, regardless of condition. It stands to reason that the limits of their capacity on hickories would far exceed what limits their capacity on sweet gums.

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