Thayer's Gull L.thayeri
16th November 2002 Choshi Chiba Japan
Note the beautiful uniform grey-brown look. But it is not as uniform as that of Glaucous-winged Gull. And the tertials and primaries are not as dark as Vega Gulls.
Note the short legs and "lower" overall impression.
Another individual that was found at 4 pm.