Unusual 1st winterBlack-headed GullLarus ridibundus
 Shinobazuike Pond, Ueno Park, Tokyo, Japan, January 15th 1992.
 "Dark-winged" black-headed gulls like this individual are often found in Japan.
 Is there a such form also in other countries? Comments

 ユリカモメ第1回冬羽 東京都台東区上野不忍の池 12月下旬
 このように雨覆全体が暗色の個体が稀に観察される。次ページのものはその中でも最も暗色の個体

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