| Common Name: | Scaup, Lesser | | Scientific Name: | Aythya affinis | | Family: | Anatidae | | 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 |
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