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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 Gull-billed tern ： ウィキペディア英語版 Gull-billed tern The gull-billed tern (''Gelochelidon nilotica''), formerly ''Sterna nilotica'' (Bridge ''et al.'', 2005), is a seabird of the tern family, Sternidae. It is now considered to be in its own genus. ==Description== This is a fairly large and powerful tern, similar in size and general appearance to a Sandwich tern, but the short thick gull-like bill, broad wings, long legs and robust body are distinctive. The summer adult has grey upperparts, white underparts, a black cap, strong black bill and black legs. The call is a characteristic ''ker-wik''. It is in length and in wingspan.〔〔(Gull billed Tern (''Gelochelidon nilotica'') ) (2011). Planet of Birds〕 Body mass ranges from .〔''CRC Handbook of Avian Body Masses'' by John B. Dunning Jr. (Editor). CRC Press (1992). ISBN 978-0-8493-4258-5.〕 In winter, the cap is lost, and there is a dark patch through the eye like a Forster's tern or a Mediterranean gull. Juvenile gull-billed terns have a fainter mask, but otherwise look much like winter adults. Juvenile Sandwich terns have a short bill, and are frequently mistaken for gull-billed tern where the latter species is uncommon, such as North Sea coasts. 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「Gull-billed tern」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.