A bird of the Anatidae family (illustration). It breeds in the mid-latitudes of Eurasia and North America. It migrates south in winter. It migrates to Japan as a winter bird and lives in lakes, rivers, and calm coastlines, but prefers freshwater. Some species breed in Hokkaido. It is about 51 cm long. As its name suggests, its beak is flatter than other ducks. The comb-like appendages on the edge of its beak are more developed than those of other species, and it takes in water from the tip of its beak and flushes it out through the comb, eating any microorganisms that remain inside. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
カモ目カモ科の鳥(イラスト)。ユーラシア大陸と北アメリカの中緯度地方で繁殖する。冬期には南方に渡る。日本には冬鳥として渡来し,湖沼,河川,波静かな海岸などにすむが,淡水を好む。北海道では繁殖しているものもある。全長約51cm。名まえのようにくちばしが他のカモ類よりも扁平で平たい。くちばしの縁の櫛歯(くしば)状の付属物は他の種よりも発達しており,くちばしの先のほうからとり入れた水を櫛を通して流し出し,中に残った微生物を食べる。
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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