Thayer's Gulls Larus thayeri
March 26th 2013 Choshi Chiba Japan
Interestingly, most Thayer's Gulls found in Choshi 2012-2013 winter were 2nd winter birds. We assume many of them are the same birds as 1st winter birds that were found abundantly in the previous winter.
A white-headed, pale-eyed atypical one.
A very dark individual.