Papers in the Biological Sciences

 

Date of this Version

2010

Document Type

Supplemental Material

Comments

From Waterfowl of North America, Revised Edition (2010). Copyright © 2010 Paul A. Johnsgard.

Abstract

Excluding extralimital species and most subspecies unless these are sometimes considered full species.

Aix [through] Spatula

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Ornithology Commons

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