Hi Preston,
I haven't recorded anything in a long time but 10-12 years ago I was
doing quite a bit in the eastern panhandle of WV. One evening I thought
I recorded a Bicknell's with call top out at or near 5KHz but it turned
out to be an aberrant Gray-cheeked. Look at the "rise time" of the call
as compared to Gray-cheeked. It should be markedly sharper with less
time to the top frequency. Compare that to Gray-cheeked calls you have a
spectrogram of. I'm not saying you didn't record one, just check this
characteristic also.
Matt Orsie - Hedgesville, WV
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