Choshi＆Hasaki Fishing port ２００５-０２０４

＞2nd winter Vega Gull×Glaucous Gull hybrid

Thayer's Gull is thinner.

Primaries of American Herring is blacker.

＞2nd winter Mongolian Gull

Vega Gull is not whiteish underparts like this.

＞2nd winter American Herring Gull

＞2nd winter Glaucous-winged Gull

＞2nd winter Heuglin's “timyrensis-type”Gull

No window on Primaries.

＞2nd winter Heuglin's “timyrensis-type”Gull

Mantle and scpulars of Heuglin's Gull is darker.

＞2nd winter Vega Gull

Primaries contrast is paid to attention.

＞2nd winter Vega Gulls

＞2nd winter Slaty-backed Gull

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