Aisa (Akisha) - Aisa (English spelling) merganser

Japanese: アイサ(秋沙) - アイサ(英語表記)merganser
Aisa (Akisha) - Aisa (English spelling) merganser
A general term for birds belonging to the genus Mergus in the family Anatidae. Seven species are known worldwide. They have a long, slender body with legs at the rear, adapted for swimming and diving. Some species can dive underwater for up to 90 seconds. Their beaks are long and slender, slightly curved at the tip, and have a row of serrated projections along the edge. This is an adaptation for catching fish. They breed in forests along lakes, marshes, and rivers. They may build nests in the shade of rocks or in grass, but most often they build nests in holes in large trees and lay their eggs inside.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
カモ目カモ科アイサ属Mergusに属する鳥の総称。世界中に7種が知られている。体は細長く,脚は体の後方につき,泳いだり潜ったりするのに適応している。種類によっては90秒も潜水できる。くちばしは細長く,先がちょっと曲がり,縁には鋸歯状の突起が並んでいる。これは魚類をとらえるための適応である。繁殖は,湖沼,河川に沿った森林で行い,巣は岩陰や草むらの中につくられることもあるが,多くの場合大木にあいている樹洞につくり,中で産卵する。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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