Tuesday, October 10, 2017

-- Where Oh Where… --


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Mark Michaels continues his historical look at Ivory-bill data here:

The history is of course interesting, though I’m not sure it will help find IBWOs today, but his main point that IBWOs likely succeeded in a greater range of habitat than Tanner would later imply, still holds (especially if you go back far enough). Mark also adds this original mapping of historical claims or specimens from uncharacteristic habitat:


In this regard I’ve previously mentioned that I thought Bill Pulliam’s writings on western Tennessee (and other claims for there) of some interest, but there are many other such odd or outlying areas as well (over the years I’ve had reports sent to me, that I couldn’t always completely discount, from southern Missouri, Kentucky, Virginia, and parts of Alabama, Georgia, and North Carolina outside the traditional IBWO range). One of my hopes for the widepread USFWS/Cornell search was that it would at least narrow any possible IBWO persistence down to a very few (perhaps 2-3) localized areas; instead the failed endeavor left open the possibility of 2 dozen or more (sometimes little-birded) areas that scarce IBWOs might conceivably utilize. The lack of a single Ivory-billed Woodpecker appearing on remote, automatic cameras by now at more traditional and well-searched areas remains a pretty devastating obstacle to hope for the species… unless indeed it has found a home in the canopies of less-obvious, lightly human-trafficked woodlands.
I don’t want to hold out too much false(?) hope for this species, but on the other hand I believe most southeast woodland habitat is rarely birded in any regular or significant fashion and the vast majority of individual woodland birds are never systematically recorded — moreover, the ornithological literature is rife with weak, unscientific conclusions/generalizations/assumptions about bird behavior, and perhaps even bird biology. There's just a lot we don't know, while pretending we do.

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Monday, October 02, 2017

-- Collins on "Periodic and Transient Motions of Large Woodpeckers" --

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Here is Mike Collins’ latest publication regarding his Ivory-bill data:

…and he lists his other major summaries of data in this bird listserv posting:
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