Calls during the night (from 10.00pm to 6.45am ), included 176 Hermit Thrush, 124 Swainson's Thrush and 8 Gray-cheeked Thrush. Pine Siskins were heard on several occasions from 3.02am on, and a Purple Finch flew over calling at 5.21am. These finches are not normally heard more than an hour before sunrise (Evans and O'Brien), but a report last year in the Wilson Journal of Ornithology documented for the first time apparent nocturnal migration of Pine Siskins. Recordings Elkins Park, PA. Pine Siskin (3.02am)
(4.29am)
Purple Finch (5.21am)
Hermit Thrush, flight calls (and a couple of chup alarm calls, 2.11am)
This Hermit Thrush used its alarm call in flight instead of the usual flight call (4.10am)
An odd Swainson's Thrush call, sounding hoarse because both syrinxes contributed to the call (1.14am)
Birds of the World Online previously The Birds of North America Online (BNA). Comprehensive information on all aspects of life history, including audio and video. By subscription.
Birdsong by the Seasons. Donald Kroodsma, Houghton Mifflin, 2009. Another great book with CDs from Dr Kroodsma.
Flight Calls of Migratory Birds WR Evans and M O'Brien. CD-ROM www.oldbird.org. Excellent source of information on flight calls
Nature's Music, The Science of Birdsong. Peter Marler and Hans Slabbekoorn. Elsevier Academic press. 2004. A treasure trove of information, advanced but very readable (comes with CD).
Peterson Field Guide to Bird Sounds of Eastern North America. Nathan Pieplow, 2017. Highly recommended, includes almost all known vocalizations of eastern US birds, with spectrograms and detailed analysis. Excellent!
Stokes Field Guide to Bird Song, Eastern Region, by Lang Elliot. 3 CDs. Of commercial recordings, this has the most comprehensive collection of songs and calls.
The Singing Life of Birds. Donald Kroodsma, Houghton Mifflin, 2005. Terrific book (plus CD), a must read.
The Songs of Wildbirds. Lang Elliott., Houghton Mifflin, 2005. Excellent photos with high quality recordings including some rare ones such as the flight song of the Western Meadowlark.
The Sound Approach to Birding. A guide to understanding bird sound. A. van de Berg, M Constantine, M. Robb. Superb discussion of bird calls and song with 2 CDs.
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