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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 Blue-headed vireo ： ウィキペディア英語版 Blue-headed vireo The blue-headed vireo (''Vireo solitarius'') is a Neotropical migrating song bird found in North and Central America. There are currently two recognized sub-species that belong to the blue-headed vireo. It has a range that extends across Canada and the eastern coast of the United-States, Mexico and some of Central America. It prefers large temperate forests with a mix of evergreen trees and deciduous under growth. As the name suggests, the blue-headed vireo is characterized by its blue-grey head and bold yellow wing bars. Both sexes are very similar in plumage and size. Juveniles also have a similar plumage. Populations of the blue-headed vireo have been steadily increasing since the 1970s and was therefore been classified as a "Least Concern" species in 2004. == Description == The blue-headed vireo has similar plumage year round and does not drastically change its appearance during the breeding season. It can be characterized by its olive green upper body, two bold yellow wing bars down the edge of its wing, and a deep blue-grey crown from which it gets its name. The juvenile plumage of immature blue-headed vireos is not distinct but very similar to the adult plumage. While this bird’s appearance is similar to the closely related Cassin's vireo (''Vireo cassinii''), the Cassin's vireo can be differentiated by its lighter yellow patches, a smaller, thinner bill, and a brownish-grey crown. There is little to no sexual dimorphism between males and females as both are similar in plumage colouration and size. Like most Vireos, the blue-headed vireo is a relatively small bird with a length of . The wingspan is usually found to be around and their weight is typically . There are some subtle differences between the ''V.s. solitarius'' and ''V.s. alticola'' sub-species. ''V.s. alticola'', the larger of the two sub-species, has a darker back with a larger wing length of and a bill length of . Conversely, ''V.s. solitarius'' is slightly smaller with a wing length of , and a bill length of .〔 The average lifespan of the blue-headed vireo in the wild has been measured to be approximately 7 years and 5 months.〔 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「Blue-headed vireo」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.