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Common Name:Gnatcatcher, Blue-gray
Scientific Name:Polioptila caerulea
Area:River Island State Park, Arizona
Date:October 30, 2012

White under-tail identifies this as a Blue-gray Gnatcatcher in contrast to the Black-tailed Gnatcatcher which has a black under-tail. Also notice the black eye brows which would indicate that this is a male Blue-gray Gnatcatcher.

Reference:Kaufman Field Guide to Birds of America by Kaufman