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The Eurasian jay (''Garrulus glandarius'') is a species of bird occurring over a vast region from Western Europe and north-west Africa to the Indian Subcontinent and further to the eastern seaboard of Asia and down into south-east Asia. Across its vast range, several very distinct racial forms have evolved to look very different from each other, especially when forms at the extremes of its range are compared. The bird is called jay, without any epithets, by English speakers in Great Britain and Ireland. It is the original 'jay' after which all others are named. ==Taxonomy and systematics== The Eurasian jay was one of the many species originally described by Linnaeus in his 18th century work ''Systema Naturae''. He recognised its affinity with other corvids, naming it ''Corvus glandarius''. Eight racial groups (33 subspecies in total) are recognised by Madge & Burn (1994): 〔 (although the text accompanying plate 11 states "some 35 races", the species account on page 95 states that 33 are recognised, and the sum of the numbers of races listed for each group is 33, indicating that the figure accompanying the plate is an error)〕 * the nominate group (nine European races), with a streaked crown. * the ''cervicalis'' group (three races in North Africa), with a rufous nape, grey mantle, very pale head sides, and a streaked or black crown. * the ''atricapillus'' group (four races in Middle East, Crimea & Turkey), with a uniform mantle & nape, black crown and very pale face. * the race ''hyrcanus'' (Caspian Hyrcanian mixed forests of Iran), small with black forecrown and broadly streaked hindcrown. * the ''brandtii'' group (four races in Siberia and northern Japan), with a streaked crown, reddish head, dark iris and grey mantle. * the ''leucotis'' group (two races in south-east Asia), with no white in the wing, a white forecrown, black hindcrown and much white on the sides of the head. * the ''bispecularis'' group (six races in the Himalayan region), with an unstreaked rufous crown, and no white wing-patch. * the ''japonicus'' group (four races in the southern Japanese islands), with a large white wing-patch, blackish face and scaled crown. 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「Eurasian jay」の詳細全文を読む スポンサード リンク
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