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Common Name:Tern, Forster's
Scientific Name:Sterna forsteri
Area:Lake Havasu State Park, Arizona
Date:January 16, 2013

The top photo shows a Forster's Tern in the winter plumage, possibly a juvenile. The lower photo is of an adult in breeding plumage.

Tingley Lake, Oregon - - - June 29, 2012

Reference:Kaufman Field Guide to Birds of North America by Kaufman / Birds of Oregon by Burrons & Gilligan