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presumed Black-throated Blue Warbler nocturnal flight calls

Fig.4. Florida May 13, 1993 (WRE).

Fig.5. Florida May 13,1993 (WRE).

Fig.6. Florida April 30, 1996 (WRE).

Fig.7. Florida April 24, 1995 (WRE).

Uncommon variant. May be chip call hybrid.

Nocturnal flight call sequences:

1. Florida April 25, 1995 (WRE). Classic double call sequence.