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A Yellow-bellied Sapsucker's wing and the "Identifiation Guide to North American Birds" by Peter Pyle

By Bird Banding Laboratory
A white-spotted black wing, is held over a book that aides in aging and sexing.
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Detailed Description

A bander examine's the wing of a Yellow-bellied Sapsucker, using Peter Pyle's book "Identification Guide to North American Birds" to age and sex the individual. 

Sources/Usage

Public Domain.