Thayer's Gull (thayeri)

(last update: January 22, 2013)

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

Thayer's Gull 1st cycle (1CY), last week of November 2010, CA. US. Picture: Hans Larsson.

In juvenile plumage, but already with paler base of bill. Dark tail and pale window on inner primaries. Densely barred uppertail coverts.