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Jay
Jays are several species of medium-sized, usually colorful and noisy, passerine birds in the crow family, Corvidae. The names ''jay'' and ''magpie'' are somewhat interchangeable, and the evolutionary relationships are rather complex. For example, the Eurasian magpie seems more closely related to the Eurasian jay than to the Oriental blue and green magpies, whereas the blue jay is not closely related to either.
==Systematics and species==
See classification box for relevant genera links. Traditionally, the crested jay (''Platylophus galericulatus'') is placed here, but apparently this is not correct, as suggested by anatomical and molecular evidence. Its placement remains unresolved; it does not seem to be a corvid at all. According to Ericson ''et al.'' (2005), jays are not a monophyletic group. Rather, they can be divided into an American and an Old World lineage (the latter including the ground jays and the piapiac), while the gray jays of the genus ''Perisoreus'' form a group of their own. The black magpie, formerly believed to be related to jays, is classified as a treepie.
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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