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presumed Mourning Warbler nocturnal flight calls 

Fig.2. New York August 16, 1989 (WRE).

Fig.3. Texas May 14, 1998 (WRE).

Fig.4. Wisconsin May 26, 2001 (WRE).

Call is slightly distorted.

Fig.5. Wisconsin May 26, 2001 (WRE).

Robins singing in the background predawn.

Fig.6. New York September 13, 1997 (WRE). 

Presumed nocturnal flight call examples:

1. New York September 1, 1992 (WRE).

2. New York September 5, 1992 (WRE).