Mongolian Gull  Larus (?) mongolicus
Feb.22nd 2009 Tokyo Imperial Palace, Japan @

This Mongolian Gull was found among about 200 Vega Gulls and 20 Slaty-backed Gulls on the Imperial Palace moat. Its black markings were 7 on the right wing, 8 on the left wing, and separated into outer and inner web on p4. The legs were pale flesh unlike obvious pink that is typical of Vega Gulls. The silhouette in flight looked longer-winged compared to Vega and Slaty-backed Gulls.