Correction: **Westward** shift of birds departing the Adirondacks!
On Sep 25, 2016, at 7:02 PM, Christopher T. Tessaglia-Hymes <c...@cornell.edu<mailto:c...@cornell.edu>> wrote: On Saturday night, there was a cleanup flight following Friday’s awesome night migration. Among the scattering of calls throughout the night, I recorded a total of 10 possible Bicknell’s Thrush night flight calls. Each of the calls peaked above 4.0 kHz with the highest two calls peaking around 4.8 kHz. While none are “clear” Bicknell’s Thrush calls (peaking above 5 kHz), the structure of the calls (sharp onset followed by a variably modulated and notably longer trailing descent) are very reminiscent of Bicknell’s Thrush call examples which are noted in the Evans and O'Brien Flight Calls of Migratory Birds CD-ROM. Overnight Saturday to Sunday morning, there was a notably Eastern component to the winds over Etna, NY. This could potentially account for an Eastward shift of birds departing from their mountaintop breeding grounds in the Adirondacks. While I realize these could arguably be particularly high frequency calls from Gray-cheeked Thrushes, it would likewise seem reasonable that these could be lower frequency Bicknell’s Thrushes. So much is yet to be learned about sexual- and age-related differences in calling frequencies of these two species. Attached are the first five calls, with the remaining five appearing in a separate message to the NFC-L eList. I welcome any feedback, and good night listening! Sincerely, 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 W: 607-254-2418<tel:607-254-2418> M: 607-351-5740<tel:607-351-5740> F: 607-254-1132<tel:607-254-1132> http://www.birds.cornell.edu/brp -- NFC-L List Info: Welcome and Basics<http://www.northeastbirding.com/NFC_WELCOME> Rules and Information<http://www.northeastbirding.com/NFC_RULES> Subscribe, Configuration and Leave<http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm> Archives: The Mail Archive<http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html> Surfbirds<http://www.surfbirds.com/birdingmail/Group/NFC-L> BirdingOnThe.Net<http://birdingonthe.net/mailinglists/NFCL.html> Please submit your observations to eBird<http://ebird.org/content/ebird/>! -- <ETNA_NY_20160924_235708_Possible Bicknell's Thrush.wav><ETNA_NY_20160925_000028_Possible Bicknell's Thrush.wav><ETNA_NY_20160925_001158_Possible Bicknell's Thrush.wav><ETNA_NY_20160925_002708_Possible Bicknell's Thrush.wav><ETNA_NY_20160925_004058_Possible Bicknell's Thrush.wav> -- Christopher T. Tessaglia-Hymes Field Applications Engineer Bioacoustics Research Program, Cornell Lab of Ornithology 159 Sapsucker Woods Road, Ithaca, New York 14850 W: 607-254-2418<tel:607-254-2418> M: 607-351-5740<tel:607-351-5740> F: 607-254-1132<tel:607-254-1132> http://www.birds.cornell.edu/brp -- NFC-L List Info: http://www.NortheastBirding.com/NFC_WELCOME http://www.NortheastBirding.com/NFC_RULES http://www.NortheastBirding.com/NFC-L_SubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NFC-L 3) http://birdingonthe.net/mailinglists/NFCL.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
