Mongolian GullL.c? mongolicus
16th November 2002 Choshi Chiba Japan

A relatively fresh Mongolian Gull.

An advanced Mongolian Gull, and a juv/1st winter Vega Gull (background).  Compare their overall colorations

Interesting markings in the inner primaries.

Broad white at the tail tips. It may resemble tails of adult Black-tailed Gulls, from a distance.

The tertial tips are worn.

And 2 more