Thayer's Gull Larus thayeri

3rd-winter Thayer's Gul Larus thayeri
Choshi Chiba Japan, February 4th 2001.  Photos by Yoshiaki Watanabe

Note the rounded head, small bill, shorter legs.
This individual has paler eyes and blackish bill. These
characteristics are not typical for 3rd winter Thayer's Gull.

Primaries dark grayish brown, not black like a Vega Gull.
Underwing nearly white.

Note the typical, contrasting light and dark outer
primaries pattern.