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Common Name:Scaup, Lesser
Scientific Name:Aythya affinis
Area:MacKerricher State Park, California
Date:June 12, 2013

Lesser Scaup have a high point at the back of the head, compared to Greater Scaup that have a more rounded crown. This male is considered rare at this location this late in the year.

Lake Havasu, Arizona - - - February 20, 2009

Reference:National Geographic Field Guide to the Birds of North America / The Sibley Field Guide to Birds of Western North America