和名: ウミアイサ, English: Red-breasted merganser, Espanol: Serreta mediana, Binomial name: Mergus serrator (Linnaeus, 1758)
Wikipedia
カモ目 > カモ科 > アイサ属 > ウミアイサ
Order: Anseriformes > Family: Anatidae > Genus: Mergus > Species: M. serrator
新旧世界の北方地域に分布し、日本へは冬鳥として渡来する潜水カモの一種ウミアイサ, Red-breasted merganser, a diving duck distributed in the northern area of the old and the new worlds. It is migratory and winters also in Japan.
2017年12月29日、葛西臨海公園に初めて行ってみた。この公園はバードウオッチング場所としても知られている。8時頃着いて公園内を歩き回った。海辺にいろいろなカモがいたが距離が遠いので識別できなかったが一応写真を撮った。
On December 29, 2017, I went to Kasai Rinkai Park for the first time. This park is also known as a bird watching place. I arrived around 8:00 and walked around the park. There were various ducks on the seaside, but I could not identify them because the distance was far. I tried to take pictures anyway.
この3羽は他のカモと違って見えた。カワアイサかウミアイサのようだ。遠かったので鮮明ではないが、頭部と胸の羽衣の境目が不明瞭なことからウミアイサと思われる。ウミアイサは新旧世界の北方地域に分布し、日本へは冬鳥として渡来する潜水カモの一種だ。
These three birds looked different from other ducks. Looking at the picture, it seems like a Common merganser or a Red-breasted merganser though it is not clear because it was far. It seems to be the Red-breasted merganser from the feature that the boundary between the head and chest plumage is unclear. Red-breasted merganser is a diving duck distributed in the northern area of the old and the new worlds. It is migratory and winters also in coastal waters in Japan.
(Kasai Rinkai Park, Tokyo, Japan, 10:54, Dec. 29, 2017, D810)