I finally got around to posting the recordings I made of the aberrant Blue-winged Warbler song I recorded last week (6/9/11) right on the Lewis/Hickman County line. As I mentioned before, I saw the bird and it looked like a normal Blue-wing, not a hybrid. I posted a video recording, even though most of the video track is useless (blurry wiggly trees with no bird). I did append two sonograms of sample songs at the end; you can pause for a longer look at them:
http://s368.photobucket.com/albums/oo125/wmpulliam/? action=view¤t=Bluewing.mp4
This is not an alternate "B" song. It is an unusual primary "A" song. I transcribed it as "seeeee-biz-biz." To my ear it sounded like a normal Blue-wing introductory note, but followed by two short Golden-wing like notes rather than the usual slow "raspberry" trill. There are many good examples on the tape I posted; the loudest and clearest ones are near the end. The sonograms more or less agree with my audio impression, with a few details differing. The introductory note is a typical Blue-wing "seeee". The subsequent notes are spectrographically more like the first note (but higher pitched) than they are like the typical Golden-wing song, but the difference is subtle. What is the oddest to me is the extremely "hard" abrupt beginning of these notes; it almost looks like they were artificially constructed with a "cut" in the tape at that point. This is also characteristic of the terminal notes of a Golden- wing song, but especially at the END of the note, not the beginning.
Evidently, a Vermivora does not have to have mixed parentage to come up with his own unique mixed-up song!
Bill Pulliam
Hohenwald TN
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