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presumed Grasshopper Sparrow nocturnal flight calls

Fig.5. Texas April 6, 1995 (WRE).

Fig.6. Florida April 9, 1989 (WRE).

Fig.7. Nebraska October 6, 1996 (WRE).

Fig.8. Nebraska October 6, 1996 (WRE). 

Note insect song and 4 kHz.