hypothetical Blackpoll Warbler nocturnal flight calls
Fig.5. New Jersey October 16, 2001 (MO).
Hypothetical identification based on the species' temporal migration pattern and abundance,
and on the frequency and modulation characteristics of the call.
Fig.6. New Jersey October 16, 2001 (MO).
Hypothetical identification based on the species' temporal migration pattern and abundance,
and on the frequency and modulation characteristics of the call.