Thayer's Gull (thayeri)

(last update: January 22, 2013)

Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 1st cycle (1CY), December 10 2011, Everett, WA. Picture: Steve Mlodinow.

Bird in juvenile plumage. Black bill. Note extensive dark tertial centres and pale crescents on primary tips.