Choshi＆Hasaki Fishing port ２００５-０２１０

＞1st winter Thayer's Gull

＞1st winter Slaty-backed Gull

Though it is seen very usual Slaty-backed Gull

A thin tail band thinks of Mongolian Gull.

Note the Axillaries pattern.

The individual difference of Slaty-backed Gull is very various.

＞1st winter Slaty-backed Gulls

Dark type.

＞1st winter Glaucous Gull×Vega Gull Hybrid

＞1st winter many Gulls

1w Glaucous-winged Gull.

1w Gulaucous Gull.

1w Gulaucous Gull.

1w Glaucous Gull "barrovianus ".

1w Glaucous Gull "barrovianus ".same bird.

1w kamchatka Gull.

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