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Eurasian blue tit
The Eurasian blue tit (''Cyanistes caeruleus'') is a small passerine bird in the tit family Paridae. The bird is easily recognisable by its blue and yellow plumage, but various authorities dispute their scientific classification.
Eurasian blue tits, usually resident and non-migratory birds, are widespread and a common resident breeder throughout temperate and subarctic Europe and western Asia in deciduous or mixed woodlands with a high proportion of oak. They usually nest in tree holes, although they easily adapt to nest boxes where necessary. Their main rival for nests and in the search for food is the larger great tit.
The Eurasian blue tit prefers insects and spiders for its diet. Outside the breeding season, they also eat seeds and other vegetable-based foods. The birds are famed for their skill, as they can cling to the outermost branches and hang upside down when looking for food.
== Taxonomy ==
This species was first described by Linnaeus in his ''Systema naturae'' in 1758 as ''Parus caeruleus''. In 2005, analysis of the mtDNA cytochrome ''b'' sequences of the Paridae indicated that ''Cyanistes'' was an early offshoot from the lineage of other tits, and more accurately regarded as a genus rather than a subgenus of ''Parus''. The African blue tit was formerly considered conspecific.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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