The following recordings are of birds calling over my house in Elkins Park, PA during the first week of October. Dominant thrushes during that time were Swainson's and Gray-cheeked, in about a 3:1 ratio, with a few Wood Thrushes and a one or two Hermit Thrushes and Veeries. Warblers were less frequent than in September with Common Yellowthroat and Blackpoll-type calls most common. Among the sparrows, White-throated was the most frequently heard. The highlight was a single American Bittern call. Some gray-cheeked thrush calls approached those of Bicknell's Thrush, and comments on the identification of these recordings would be welcomed.
All calls are presumptively identified as no birds were seen.
Gray-cheeked Thrush, typical calls, 4.45am
Buzzy variant, 5.10am
Gray-cheeked and Swainson's Thrush calls, 5.29am
Lower and higher calls, 4.56am
In this cut the gray-cheeked call is consistent with the appearance of Bicknell's, 11.53pm
A Swainson's Thrush variant "doubled" call, the bird using both syrinxes to create the sound, 9.43pm
A late Veery, 3.03am
An early Hermit Thrush, 2.45am
This strongly modulated call is similar in appearance to the buzzy Rose-breasted Grosbeak call as described on the Flight Calls DVD by Evans and O'Brien, 9.21pm
Another presumed Rose-breasted Grosbeak buzz, 10.59pm
The flight call of the Scarlet Tanager is a clear chu-wee, and seems to be less frequently heard at night than those of the thrushes,11.06pm
White-throated Sparrows began arriving in earnest in early October, 1.46am
Chipping Sparrow, 1.48am
Green Heron, 3.22am
American Bittern, 2.46am
This single owl wail may be an Eastern Screech-Owl, or possibly a Northern Saw-whet Owl; the call closely matches that on Cornell's Voices of North American Owls, Disc 2, cut 64.