While I’m certainly no expert on Bicknell’s calls, and likewise defer to 
others, I’ve definitely been paying attention to possible calls and I’ve been 
trying to tease apart possible characteristics more consistent with Bicknell’s 
versus Gray-cheeked.

I took a little time last night to manipulate your recordings to make them more 
audible – I had to increase amplitude by at least 15-20 times and added 
duplicate sound to the front end of the calls to give my brain time to adjust 
and to hear the call of interest.

The first call, which peaked nicely around 5.3 kHz, I personally would have no 
hesitation in labeling as a Bicknell’s Thrush. Likewise, the second call, which 
peaks right around 5.1 kHz, I’d say has solid potential as a Bicknell’s Thrush.

Echoing Matt’s comment, the very steep and sharp onset of the call is a 
characteristic I’m suspicious may be more reliably unique to Bicknell’s 
Thrushes. Similar to how Gray-cheeked Thrush calls can peak all over the place 
between 3 kHz and darned close to 5 kHz, there may be some acceptable 
Bicknell’s that are actually lower-frequency callers, below 5 kHz, and possibly 
identifiable simply by the structure of the call, rather than purely by the 
peak frequency – although high frequency is a dead ringer (if above 5 kHz) for 

Hope this helps, if at least somewhat…thoughts?

Chris T-H

On Oct 5, 2016, at 7:16 PM, Preston Lust 
<<>> wrote:

10/4-5/16, 8:00 PM-6:30 AM -- Yard, Westport CT

While looking over recordings from this night, I came across two calls that 
appeared to me significantly higher and purer-toned than standard gray-cheeked 
calls. Both peak at around 5 kHz. The call at 2.55.46 is the highest of the 
two, and thus more likely Bicknell's. Am I correct in calling them BITH? Thank 
you for any assistance.

Preston Lust, Westport CT
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