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Song but not plumage varies geographically among Willow Flycatcher ( Empidonax traillii ) subspecies
Mahoney, Sean M., Reudink, Matthew W., Pasch, Bret, Theimer, Tad C.Journal:
Journal of Avian Biology
DOI:
10.1111/jav.02621
Date:
November, 2020
File:
PDF, 1.27 MB
2020