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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 Silvery pigeon ： ウィキペディア英語版 Silvery pigeon The silvery pigeon (''Columba argentina''), also known as silvery wood-pigeon or grey wood-pigeon is a species of pigeon found in Indonesia and Malaysia. It was thought to be extinct but wild populations rediscovered in 2008 near Masokut Island might represent this species. ==Description== The silvery pigeon is not distinguishable from the pied imperial pigeon at a distance, although this is not necessarily true vice versa; as the pied imperial pigeon can vary between a pale grey, pure white and even yellowish colouration, it is often possible to tell that a bird is ''not'' a ''C. argentina''. At close quarters, the silvery pigeon may be recognized by a few characteristics: The plumage is always a pale silvery grey, with black remiges and ends of the tail feathers; there may be a slight greenish sheen on the feathers of the backsides of the neck. The black part of the tail is equal in length in all feathers, whereas it forms a black triangle pointing headwards on the underside of the pied imperial pigeon's tail. Most distinguishing characteristics are located on the head, which is shaped differently, with a sloping forehead (rounded in the PIP), conspicuous dark red or purplish eye-wattles (none in the PIP) and eyes, and a bill that is darker at the base (lighter at the base in the PIP), being dusky purple with a pale apple-green tip. The feet are bluish-grey, mottled with varying amounts of red. The birds are slightly smaller than the PIP, with a total length of around 36 cm, females being marginally larger and darker than males on average, and juvenile birds are apparently more sandy-coloured on the upperpart feather fringes and breast. While the weight is not recorded, comparison with related species gives an estimate of 350 grams on average. The colour pattern, unusual for a ''Columba'' pigeon, probably represents convergent evolution towards the PIP, and possibly even a case of Müllerian mimicry, the anti-predator attribute being the PIP's habit to aggregate in large flocks which makes it harder for predators to pick out individual birds, and enables the much rarer silvery pigeon to share this advantage. 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「Silvery pigeon」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.