Comprehensive information on all aspects of life history, including audio and video. The Birds of North America Online (BNA).Of commercial recordings, this has the most comprehensive collection of songs and calls. Stokes Field Guide to Bird Song, Eastern Region, by Lang Elliot.Highly recommended, includes almost all known vocalizations of eastern US birds, with spectrograms and detailed analysis. Peterson Field Guide to Bird Sounds of Eastern North America.A treasure trove of information, advanced but very readable (comes with CD). Nature's Music, The Science of Birdsong.Excellent source of information on flight calls Flight Calls of Migratory Birds WR Evans and M O'Brien.Another great book with CDs from Dr Kroodsma. These are soft contact calls between several birds, and were barely audible (Jan, PA) The Eastern Bluebird has a chatter-like call used both as an alarm call and, as in this case, amongst birds in a migrating flock (about a dozen birds, Oct, PA).Īlso heard are trill-like interaction calls, at 6-9 and 19-23s.Īggressive reaction between two birds, with a third singing (Oct, PA). This progresses into a whit-whit-whit with further agitation (May, NJ).Ĭalls by several Wood Thrushes shortly after sunset (June, PA). The Wood Thrush has a soft bubbly alarm (with Gray Catbird calls, July, PA). In migration Swainson's and Gray-cheeked Thrushes are very vocal while flying at night and when first landing before dawn, but are mostly silent during the day. Presumed alarm call, but similar to flight call. Gray-cheeked Thrush, two calls, peeuu and pyu, also on breeding grounds in Alaska in June. Whip and werr, (breeding grounds in Alaska in June). Swainson's Thrush whip calls (with song phrases, July, ME).

The chup call is the most frequently heard call during the day in migration, especially at dawn (Apr, PA). Hermit Thrush wheer, this call seems to be heard more often on the breeding grounds (July, ME) Interestingly, Veeries also show a lot of variability in their flight calls. Like the robin, the Veery has a number of contact and alarm calls. Most thrushes have this 'hawk alarm' call. The whistle call is ventriloquial and is heard when an intruder is close to the nest or in the presence of a hawk (May, NJ). Quiet calls by one bird close to another (Mar, PA). At the end of the recording the birds suddenly flush with high pitched flight calls (Feb, NJ). Puk-puk-puk, by a single aggressive bird in a foraging flock. The American Robin has a variety of alarm or contact calls, often heard at dusk:

Pa hawk sounds at night