first-winter bird; uniform brown, dark wingtips (California, USA; 2007-01-20)

Thayer's Gull
Larus thayeri

Native Range: North America

Notes: a rather nondescript four-year gull closely related to Iceland Gull; identifiation is further complicated by the fact that it may hybridize with several other gull species.

dark iris; relatively small, dark-colored bill (California, USA; 2007-01-20)