[cobirds] atypical Blue-winged Warbler song type

Hi folks,

As I mentioned the other day, I was surprised to hear the song of the Blue-winged Warbler in Welchester Grant Tree Park. This was a lifer for me, and as I walked around the park waiting to hear that bee-BUZZZZ that I'd gotten familiar with over the years in commercial sound recordings, it was almost a disappointment to instead hear something more akin to a Golden-winged Warbler song. If not for the fact that there were zero other warblers singing in the area at the time, I might have overlooked this quiet, buzzy song. At any rate, I made sure to get a look at the bird in the act of singing just to make sure it was what I was told it would be. (And it was.)

Yesterday I took a little time to investigate this, and found only one example of a Blue-winged song that resembles the recording I made below. It was a recording made by Andrew Spencer in Arkansas back in 2007, and in his notes on xeno-canto he too mentions that although the bird appeared phenotypically pure, the song was more like a Golden-winged song. 

The link to my recording is here:

https://soundcloud.com/bay-wren/bwwa-song

And the link to Andrew's sample on xeno-canto is here:

http://www.xeno-canto.org/33468

Note that neither of these songs resembles the so-called Type I or Type II songs usually recognized for the species (the territorial bee-buzzz song or the nesting trill-buzz song, respectively).

I'll be sharing my recording on xeno-canto soon.

Thanks,

Eric DeFonso

Boulder, CO

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