Thayer's Gull (thayeri)(last update: January 22, 2013) |
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Thayer's Gull 1st cycle (1CY), November 05 2010, Fernhill, OR. Picture: Birdmeister.Visit: Birdmeiuster's weblog. Bird in juvenile plumage. Black bill. Note extensive dark tertial centres and pale crescents on primary tips. |