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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 Black crake ： ウィキペディア英語版 Black crake The black crake (''Amaurornis flavirostra'') is a waterbird in the rail and crake family, Rallidae. It breeds in most of sub-Saharan Africa except in very arid areas. It undertakes some seasonal movements in those parts of its range which are subject to drought. No subspecies have been described. ==Description== The adult black crake is long with a short tail and long toes. As its name implies, the adult has mainly black plumage, with a brown olive tone on the wings and upperparts which is rarely detectable in the field. The eye is red, the bill is yellow (hence the ''flavirostra'' of the binomial name), and the legs and feet are red, duller when not breeding. The sexes are similar, but the male is slightly larger. Most males, but only 10% of females, have a hooked upper mandible. The immature bird has brown upperparts and a dark grey head and underparts. Its bill is greenish yellow, and its feet and legs are dull red. The downy chicks are black, as with all rails. The main call of the black crake is a duet, starting with a throaty chattering ''krrrok-kraaaa''. The response is a dove-like cooing ''coo-crr-COO''. 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「Black crake」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.