"....The truth is out there."
-- Dr. Jerome Jackson, 2002 (... & Agent Fox Mulder)
“There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.”
"All truth passes through 3 stages: First it is ridiculed. Second, it is violently opposed. Third, it is accepted as self-evident."
-- Arthur Schopenhauer
Friday, May 13, 2011
-- Wingbeats... --
Note: Google's Blogger platform was down for 48+ hours (making the posting of new blogposts or comments un-doable), but appears to be working once again....
Generally speaking throughout the avian kingdom, larger birds have slower wingbeat frequencies than their smaller cousins. Louis Bevier's original 2007 analysis for PIWO vs. IBWO wingbeat frequency follows in that vein, for any who haven't seen it:
There is NO firm data for what the range of wingbeat frequency for the Ivory-billed Woodpecker should be. None, just speculative conjecture. The one specific piece of old Singer Tract audio (of a bird flapping) that is sometimes alluded to for analysis is useless and meaningless, with no accompanying video to know WHAT is even doing the flapping --- but even presuming it is an Ivory-billed Woodpecker it is at least as likely that the bird is merely flapping to maintain balance on a tree, or fending off an intruder/interloper, than a recording of actual flight (though it may be 'hopping' from one branch to a nearby one). This specific area of analysis is fraught with problems and assumptions (and uncontrolled variables), but I believe Bevier's analysis, in this instance, is as good as is out there. Thusly, for now, I'm more interested in video clips of purported IBWOs that show birds flying below or at the low end of the purported range for PIWO wingbeat frequency (which also is not well-established).
But short of a truly definitive photo or video (requiring no analysis, beyond proof of authenticity), what I'd really like to see at this point are more high quality and lengthy sightings that come from multiple experienced, credible observers (lone observer claims simply are not taken seriously by most of the birding establishment at this point), and preferably, then, repeated by others (photos, video can come later, if at all).
So far, it ain't happenin' :-(
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