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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク American black duck ： ウィキペディア英語版 American black duck The American black duck (''Anas rubripes'') is a large dabbling duck. American black ducks are similar to mallards in size, and resemble the female mallard in coloration, although the black duck's plumage is darker. It is native to eastern North America and has shown reduction in numbers and increasing hybridization with the more common mallard as that species has spread with man-made habitat changes. ==Description== American black ducks weigh , measure in length and across the wings.〔() (2011).〕 Although they are similar to mallards in size and broadly overlap in weight, according to a manual of avian body masses, they have the highest mean body mass in the ''Anas'' genus, with 376 males averaging and 176 females averaging .〔''CRC Handbook of Avian Body Masses'' by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.〕〔''CRC Handbook of Avian Body Masses, 2nd Edition'' by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.〕 The American black duck somewhat resembles the female mallard in coloration, although the black duck's plumage is darker. The male and female black duck are generally similar in appearance, but the male's bill is yellow while the female's is a dull green. The head is slightly lighter brown than the dark brown body, and the speculum are iridescent violet-blue with predominantly black margins. The black duck has orange legs and dark eyes. In flight, the white underwings can be seen in contrast to the dark brown body. The behaviour and voice are the same as for the mallard drake.〔(【引用サイトリンク】title=American Black Duck Facts and Figure )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「American black duck」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.