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The long-tailed tit or long-tailed bushtit (''Aegithalos caudatus'') is a common bird found throughout Europe and Asia. There are several extensive accounts of this species, most notably Cramp and Perrins, 1993; Gaston, 1973; and Harrap and Quinn, 1996. The majority of relevant research has been directed at its social and breeding behaviour. ==Taxonomy and systematics== The long-tailed tit was first classified as a true tit of the ''Parus'' group. ''Parus'' has since been split from the Aegithalidae, with the latter becoming a distinct family containing three genera: *''Aegithalos'' (long-tailed tits), five species including ''A. caudatus'' *''Psaltria'' (pygmy bushtit), monotypic *''Psaltriparus'' (American bushtit), monotypic. This is the only representative of the Aegithalidae in northern Eurasia.〔Cramp, S. and Perrins, C. (1993) Handbook of the birds of Europe, the Middle East and North Africa: the birds of the Western Palearctic: Flycatchers to Shrikes. Volume 8. Oxford, Oxford University Press.〕 The long-tailed tit exhibits complex global variation with 19 races recognised, divisible into three groups:〔Harrap, S. and Quinn, D. (1996) Helm Identification Guides: Tits, Nuthatches & Treecreepers. Helm Identification Guides.1 ed. London, Christopher Helm (A&C Black)〕 *the ''caudatus'' group in northern Europe and Asia. ''A. c. caudatus'' has a pure white head *the ''europaeus'' group in southern and western Europe, north-east China, and Japan. Separating ''rosaceus'' from other members of the ''europaeus'' group though is problematic, relying on varying thickness of the crown stripes and amount of streaks and colour on the underparts〔 *the ''alpinus'' group in Mediterranean Europe and south-west Asia. The silver-throated bushtit was formerly considered conspecific. Where the groups meet there are extensive areas occupied by very variable ‘hybrids’. The British long-tailed tit, subspecies ''rosaceus'', belongs to the ''europaeus'' group. Biochemical evidence has shown Aegithalidae to be closely related to the babblers.〔 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「Long-tailed tit」の詳細全文を読む スポンサード リンク
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