Adult Winter Mongolian Gull 　Larus (?) mongolicus

Lower right bird. With a Slaty-backed Gulls.

With a Slaty-backed Gulls. Very beautiful bird！

Note the very whitish underparts and long primaries and pale color legs and long bill.

Such as lesser coverts are already worn.

Note the thin head streaking. It's very few compared with Vegae.

I think this bird is typical Mongolian Gull. With 1w Slaty-backed Gulls.

Note the long wing and black marking on P4. Mirror is one.

The same bird same place from December 30 2004.

With a juv Slaty-baced Gull.

It's a very fantastic!!

From Mori Hokkaido Japan. December 31.