presumed Red-breasted Nuthatch nocturnal flight calls
Fig.3. New York September 2, 1993 (WRE).
Nocturnal flight call sequences:
1. New York September 1, 1993 (WRE). At least two birds calling in nocturnal migration.
2. New York September 2, 1993 (WRE). Single bird calling in nocturnal migration preceded by weak warbler nocturnal flight calls and occurring simultaneously with a Barred Owl call.
3. New York September 2, 1993 (WRE). Single bird calling in nocturnal migration.