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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 Northern hawk-owl ： ウィキペディア英語版 Northern hawk-owl The northern hawk-owl (''Surnia ulula'') is a non-migratory owl that usually stays within its breeding range, though it sometimes irrupts southward. It is one of the few owls that is neither nocturnal nor crepuscular, being active only during the day. This is the only living species in the genus ''Surnia'' of the family Strigidae, the "typical" owls (as opposed to barn owls, Tytonidae). The species is sometimes called simply the hawk owl; however, many species of owls in the ''Ninox'' genus are also called "hawk owls". ==Description== Male northern hawk-owls are generally long and weigh . Females are slightly bigger with a length of and a mass of about . Both male and female have similar wingspans of about . The northern hawk-owl plumage is relatively dark brown with an off white spotting pattern on all dorsal parts of the body with the exception of the back of the neck which boasts a black v-shaped pattern. The underbelly is generally white or off-white which continues to the toes with brown bands on the breast and stomach. It also boasts a long tail with brown banding. The northern hawk-owl has a smokey white face with a black border, a flat head, yellow eyes and a yellow curved beak.〔Duncan, James R. and Patricia A. Duncan. (1998) (Northern Hawk-Owl (''Surnia ulula'') ), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: .〕 The northern hawk-owl has been said to resemble a hawk in appearance and in behavior. In North America, its appearance in flight is often considered similar to a Cooper's hawk (''Accipiter cooperii''). It has been suggested that this may be because the hawk-owl may partially fill an important diurnal niche similar to that of day hunters such as hawks.〔 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「Northern hawk-owl」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.