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presumed Wilson's Warbler nocturnal flight calls

Fig.3. New York September 4, 1992 (WRE).

Fig.4. New York September 1, 1992 (WRE).

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

Fig.6. New York September 5, 1992 (WRE).

Fig.7. New York September 5, 1992 (WRE).

Fig.8. New York September 5, 1992 (WRE).

Fig.9. Wisconsin June 4, 2001 (WRE).