presumed Swainson's Thrush nocturnal flight calls
Fig.2. New York September 3, 1989 (WRE).
Fig.3. Minnesota September 14, 1988 (WRE).
Fig.4. New York September 12, 1992 (WRE).
Nocturnal flight call sequences:
1. New York September 16, 1990 (WRE). Birds descending from nocturnal migration at dawn with occasional Veery and Gray-cheeked Thrush calls. Great Horned Owl calling in the background.
2. New York September 11, 1992 (WRE). Birds descending from nocturnal migration.
3. Minnesota September 14, 1988 (WRE). Birds in nocturnal migration with a few Gray-cheeked Thrushes.
4. New York September 12, 1992 (WRE). A few birds descending from nocturnal migration at dawn.