I found David Jamison's web site EXPLORE PUGET SOUND HABITATS AND MARINE LIFE to be extremely useful in figuring identifications.
A nice beach walk with Mary Ellen while we had a -3.06 feet Low Tide
Medium gray mantle, yellow bill with red spot, pink legs, and gray-tipped (vs. black and white) primaries. ID based on www.pugetsound.edu/academics/academic-resources/slater-mu.... IMAG2487
Found at the south end rocky spit of Constellation Marine Park 4/27/13
San Diego County, California, US
Very common gulls in the area, they love hanging out in Carkeek Park.
adult in flight
near Protection Island,
Jefferson Co., Washington
3 June 2000
The Glaucous-winged Gull, Larus glaucescens, is a large, white-headed gull residing from the western coast of Alaska to the coast of Washington. It also breeds on the northwest coast of Alaska. During non-breeding seasons they can be found along the coast of California. It is a close relative of the Western Gull and frequently hybridizes with it, resulting in identification problemsÃ¢â‚¬â€particularly in the Puget Sound area. Glaucous-winged Gulls are thought to live about 15 years. One...