Choshi＆Hasaki Fishing port ２００５-０２０６

＞1st winter American Herring Gull

＞1st winter Vega Gulls

＞1st winter Heuglin's “timyrensis-type”Gull

＞1st winter Slaty-backed Gulls

＞1st winter Slaty-backed Gull

Note the primaries pattern.This stripe is a feature of unmistakable Slaty-backed Gull.

The tail pattern is very mysterious. Such two stages tail band pattern, I have not seen up to now.

・ Such a tail pattern had been seen with Mongolian Gull, Scandinavian Herring Gull, Heuglin's Gull and so on.

＞1st winter Mongolian Gull

The tail band is narrow.

＞1st winter Kamchatka Gull

＞2nd winter Vega Gulls

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

＞Adult winter Thayer's Gull

This bird was found in 1987.

＞Adult(4th) winter Glaucous Gull “barrovianus ”

＞Adult winter Heuglin's “timyrensis-type”Gulls

＞Adult winter Vega Gulls

Same bird ↑.P10-5.

P10-5

＞Black-headed Gulls

＞Black-tailed Gulls

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