Presumed
Mongolian Gull L.(?)
mongolicus
January 24th
2003 Choshi Chiba Japan
This individual has really nice characteristics to be a
Mongolian Gull, especially 8 black-marked primaries, black-marked
long bill, and general structure. But its rich winter
mottling around the neck might be unusual.
Note the powerfully-built
body. The deep chest seems to hint the neck is long.
The
Mongolian Gull with 2 Vega Gulls
Note their
bill/head structures.
A Vega
Gull (left), and the Mongolian Gull (right).
The red gonydeal spot of
the Mongolian Gull does not reach upper edge of lower
mandible.
The wing
has 8 black-marked primaries. And the pattern of the
underside P10 differs from Caspian Gulls.