Attached is a screen grab of the flight call in Raven Pro showing duration and frequency bounds.
Sincerely, Chris T-H On Sep 30, 2012, at 2:00 AM, Christopher T. Tessaglia-Hymes wrote: Early this morning, while awake and listening to the occasional but regular waves of migrants passing overhead, I bolted alert after hearing this much higher frequency and longer in duration "Gray-cheeked Thrush", immediately thinking Bicknell's Thrush. I turned on my laptop monitor and snapped into the buffer in Raven Pro to locate the call that had just occurred. Upon seeing the call structure in Raven, I immediately recognized it as being a beautiful example of a BICKNELL'S THRUSH! This bird probably passed within a few hundred yards of my recording station in Etna, NY, shortly after 1:15am. The winds are relatively calm right now, with the directional movement of birds being out of the Northeast (Adirondacks). This call conservatively peaks out at 4.908 kHz (or even 5.01kHz, depending upon how I adjust my spectrogram settings), and with a call duration being fairly "long" at 387 milliseconds. The call structure has a sharply peaked onset, with a relatively long and even descent. Gray-cheeked Thrush lacks the sharply peaked onset and is typically much more arched in appearance. Further, the typical Gray-cheeked Thrush call peaks out around 4.0kHz, with occasional variation to 4.5kHz. Good night listening! Sincerely, Chris T-H PS - as I type this, the Coyotes are in a momentary full swing of yipping -- 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 M: 607-351-5740 F: 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/[email protected]/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_20120930.011655_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 M: 607-351-5740 F: 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/[email protected]/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/ --
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