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Black-capped chickadee : ウィキペディア英語版 | Black-capped chickadee
The black-capped chickadee (''Poecile atricapillus'') is a small, nonmigratory, North American songbird that lives in deciduous and mixed forests. It is a passerine bird in the tit family Paridae. It is the state bird of both Maine and Massachusetts in the United States, and the provincial bird of New Brunswick in Canada. It is well known for its capacity to lower its body temperature during cold winter nights as well as its good spatial memory to relocate the caches where it stores food, and its boldness near humans (sometimes feeding from the hand). It is almost universally considered 'cute' due to its oversized round head, tiny body, and apparent curiosity about everything, including humans.〔(【引用サイトリンク】url=http://www.allaboutbirds.org/guide/black-capped_chickadee/id )〕 ==Taxonomy== Though often placed in the genus ''Parus'' with most other tits, mtDNA cytochrome b sequence data and morphology suggest that separating ''Poecile'' more adequately expresses these birds' relationships. The American Ornithologists' Union has treated ''Poecile'' as a distinct genus for some time. The genus name ''Poecile'' has often been treated as feminine (giving the species name ending ''atricapilla''); however, this was not specified by the original genus author Johann Jakob Kaup, and under the ICZN, the genus name must therefore be treated by default as masculine, giving the name ending ''atricapillus''.〔Del Hoyo, J., Elliot, A., & Christie D. (eds). (2007). ''Handbook of the Birds of the World''. Volume 12: Picathartes to Tits and Chickadees. Barcelona: Lynx Edicions. ISBN 978-84-96553-42-2〕 At one time the black-capped chickadee was considered by some to be conspecific with the willow tit of Eurasia, due to their very similar appearance. This is reflected in an older version of the Peterson Field Guide for the Birds of Britain and Europe, which states "N Am. Black-Capped Chickadee" as an alternate name for the willow tit. In fact the willow tit, black-capped chickadee, marsh tit and Carolina chickadee are all very similar to one another in appearance.
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