Thayer's Gull (thayeri)(last update: January 22, 2013) |
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Thayer's Gull 1st cycle (2CY), January 19 2014, Marin County, California. Picture: Amar Ayyash.Dark tail and pale window on inner primaries. Fine uniform dark texture on underparts and in the neck. Barred on uppertail coverts and rump. |