Nocturnal flight calls

Variation in Swainson's Thrush nocturnal flight calls compiled by Andrew Farnsworth.
September 1996-September 2004 - NE US, Clemson, SC, Evans and O'Brien
(2002) - description: Nocturnal flight-calls of Swainson's Thrushes during fall migration.  Recordings were made by positioning a flowerpot microphone to zenith in the night sky.  Some of these
recordings are from previously published recordings of Evans and O'Brien (2002). 


                                                                                                                           Click here to listen.






Date: 15 May 2007      Time: 0028      Location: Caroline, Tompkins Co. New York
Description: Duration- 167 msec      min Frequency- 2477 Hz      max Frequency 3359 Hz


                                                    Click here to listen.




Date: 25 May 2007      Time: 0414      Location: Caroline, Tompkins Co. New York
Description: Duration- 248 msec      min Frequency- 1721 Hz      max Frequency 3149 Hz


                                                            Click here to listen.



Date: 30 May 2007      Time: 2350      Location: Caroline, Tompkins Co. New York
Description: Duration- 192 msec      min Frequency- 2225 Hz      max Frequency 3316 Hz


                                                        Click here to listen.

23 September 2004 - Caroline, Tompkins Co. New York - description:Two examples of nocturnal flight calls recorded between 0543 and 0630 of Swainson's Thrush. The 2 spectrographs below are from 2 flight calls made almost simultaneously by 2 birds. The first spectrograph is that of the first vocalization, and the second spectrograph was made from the second vocalization. Recordings were made by positioning a parabolic reflector with microphone at the morning sky. Click on the spectrographs to hear the recordings.

Example 1
Example 2