Thayer's Gull (thayeri)(last update: January 22, 2013) |
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Thayer's Gull 1st cycle (1CY), December 2009, California, US. Picture: Chris Gibbins.Visit: Chris's weblog. Bird in juvenile plumage. Note bold pattern on undertail coverts and 'smooth' plain brown underwing coverts. Bi-coloured bill. |