A further examination of wing and tail formulae in Empidonax and Contopus flycatchers

P. Pyle
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Journal: 
Era of Allan Phillips: A Festschrift
Volume: 

Abstract

Useful new information on identifying and sexing specimens of Empidonax and Contopus flycatchers, two of the most critically examined genera of North American birds, is presented in a format most useful for in-hand determinations.

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Year: 
1997
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