Mongolian Gull Larus (?) mongolicus
Feb. 5th 2013 Choshi Chiba Japan
The Mongolian Gull with a Vega Gull in the background. Note the somewhat cachinnans-like longish structure, white head and bill pattern.
The Mongolian Gull with 2 Vega Gulls in the background. Most Vega Gulls are still in full winter plumage in this time of year.
Note the mixed leg color; pink webs and yelowish tibia.