Thayer's Gull (thayeri)

(last update: January 22, 2013)

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

Thayer's Gull 1st cycle (2CY), February 05 2011, Westmoreland Park, OR. Picture: John Rakestraw.

Bird in juvenile plumage by February. Black bill with paler base. Note extensive dark tertial centres and pale crescents on primary tips.