Hi Chris,

I was hoping someone else would give you some feedback on your nice series of 
thrush calls. Not only have I been talking too much lately but this topic can 
be a special quagmire. 

I want to note that I have one monitoring station that is the first landfall 
directly southwest of the island of Newfoundland. Therefore, the flight calls 
of Gray-cheeked Thrush that I record there are very likely Catharus minimus 
minimus. They are consistently less humped and more descending than Catharus 
minimus aliciae. Their maximum frequency is 4 KHz or a little greater. I had 
another monitoring station that is the first landfall southwest of Cape Breton 
Island where Bicknell’s Thrush breed. These thrush calls have a maximum 
frequency over 5 kHz. I have attached a photo illustrating these three types of 
calls, including one from Louisiana provided by Bill Evans. Perhaps some of 
your calls are C.m.minimus. Given this race is believed to winter in South 
America, including Columbia, one cannot rule out the possibility of them flying 
over Etna, NY. 

It would be interesting to get a series of night flight calls from these two 
species in areas close to their breeding range.


John Kearney

Carleton, NS


From: bounce-120825839-28417...@list.cornell.edu 
[mailto:bounce-120825839-28417...@list.cornell.edu] On Behalf Of Christopher T. 
Sent: September-26-16 08:15
To: NFC-L <nf...@list.cornell.edu>
Subject: [nfc-l] Bicknell's Thrush - More Classic Example


Albeit soft and slightly distant, this bird was recorded over Etna, NY on 23 
September 2016 at 23:25. 


I would consider this to be a classic example because its peak frequency is 
above the 5kHz “safety” demarkation line.


This bird peaks around 5.25 kHz and has an overall duration of about 250 
milliseconds. Similar to the “possible Bicknell’s Thrush” examples posted 
yesterday, the sharp onset followed by a variably modulated and notably longer 
trailing descent is the call structure which caught my eye while browsing 
through my data last night.


Attached are both the recorded call (with some lower cricket and noise bands 
gently filtered out) and a screen grab of the call for visual representation.


Good night listening!



Chris T-H



Christopher T. Tessaglia-Hymes
Field Applications Engineer
Bioacoustics Research Program, Cornell Lab of Ornithology
159 Sapsucker Woods Road, Ithaca, New York 14850
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<tel:607-254-1132> 607-254-1132

 <http://www.birds.cornell.edu/brp> http://www.birds.cornell.edu/brp



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