Mongolian Gull Larus cachinnans? mongolicus
April 3rd 2004 Sakawagawa-river Odawara Kanagawa Japan
This Mongolian Gull was found in a flock composed of 300 large gulls, Vega Gulls and taimyrensis-type Gulls and Slaty-backed Gulls.
Mongolian Gull: left, Vega Gull: right.
The white underparts of the Mongolian Gull sharply contrasted with dark underparts of Vega Gulls.