A bird of the Anatidae family (illustration). Males are about 48cm long, females about 41cm long. They are found in northeastern China, Primorsky Krai, Sakhalin, Japan, etc., and those that breed in cold regions spend the winter in eastern China and Taiwan. They have also been released in parts of Europe, where they breed naturally. In Japan, they are found throughout the country as resident or migratory birds, living in lakes, marshes, and rivers in mountainous areas surrounded by forests. They nest in hollows of large trees and lay 7-12 eggs per clutch between June and August. When the chicks hatch, they follow their parents down to the water and are raised by the female. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
カモ目カモ科の鳥(イラスト)。雄は全長約48cm,雌は約41cm。中国東北,沿海州,サハリン,日本などに分布し,寒冷地で繁殖するものは,冬季中国東部,台湾で越冬する。またヨーロッパの一部にも放鳥されたものが自然繁殖している。日本では留鳥または漂鳥として全国に分布し,林に囲まれた山地の湖沼,河川などにすむ。大木の樹洞に営巣し,6~8月ころ1腹7~12個の卵を産む。孵化(ふか)した雛は親に従って水上に飛び降り,雌親に養育される。
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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