Thayer's Gull (thayeri)
(last update: January 22, 2013)
Thayer's Gull 3rd cycle (4CY), January 01 2012, Tukwila, WA. Picture: Amar Ayyash.
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Present at Mouth of Cedar River and Tukwila.
Outer primary tips very weak. Many immature markings on coverts and tertials. Fine bill may suggest female.