Mongolian Gull Larus cachinnans(?) mongolicus
March 31th 2005 Choshi Chiba Japan

This page shows a male-type, large individual that shows very cachinnans-like longish structure.

Vega Gulls on March 26th 2004 for comparison

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Caspian Gull Larus cachinnans
January 13th 2005 Barka Oman