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The robins are small passerine birds comprising the genus ''Erithacus''. They were formerly classed as members of the thrush family, but now considered to be Old World flycatchers of the chat subfamily (Saxicolinae). The vernacular name "robin" is also applied to some other chats, as well as certain thrushes and some unrelated songbirds; see Robin#Birds. The three or four species presently placed here are: * European robin, ''Erithacus rubecula'' * * Tenerife robin, ''Erithacus (rubecula) superbus'' * Japanese robin, ''Erithacus akahige'' * Ryukyu robin, ''Erithacus komadori'' The two Asian species were formerly considered to be members of the genus ''Luscinia''; apparently, both genera need to be split and rearranged. The European species would then be the only remaining ''Erithacus'', whereas the East Asian species are closely related to some species from the genus now classed as ''Luscinia'', for example the Siberian blue robin (''Luscinia cyane'') and would form a new genus. These species are stocky small birds with an upright stance and short frequently cocked tail. They have a plain brown back, and a red or black face and breast contrasting with whitish or grey underparts. The females of the Asian species are much duller than the males, but in the European robin differences between the sexes are minimal and restricted to the shape of the boundary between the red and brown plumage on the forehead. ''Erithacus'' robins are territorial woodland birds which build a neat cup nest in a hole or on the ground, and have a life expectancy of just over a year. They watch for insects, worms and other invertebrates from a low perch, and feed mostly on the ground, hopping on strong legs with frequent stops. ==Fossil record== ''Erithacus minor'' (Pliocene of Beremend, Hungary) 〔Kessler, E. 2013. Neogene songbirds (Aves, Passeriformes) from Hungary. – Hantkeniana, Budapest, 2013, 8: 37-149.〕 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「Erithacus」の詳細全文を読む スポンサード リンク
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