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speckled chachalaca
The speckled chachalaca (''Ortalis guttata'') is a species of bird in the family Cracidae. It is found in forests and woodlands in the western Amazon Basin. It has distinct white scaling/spotting on the lower neck and chest, but otherwise it resembles other chachalacas, it being vaguely pleasant (though far more arboreal and social), and with an overall brown plumage.
==Taxonomy==
Several taxa formerly included as subspecies of the speckled chachalaca have been considered valid species: the scaled chachalaca (''O. squamata'' Lesson, 1829) in south-eastern Brazil, and the East Brazilian chachalaca (''O. araucuan'' Spix, 1825) in eastern Brazil. The last of these has also been referred to as the Brazilian chachalaca or the white-bellied chachalaca, although the former arguably is problematic as numerous other chachalacas are found in Brazil, while the latter leads to easy confusion with the Central American ''Ortalis leucogastra''. Alternatively, "''araucuan''" and "''squamata''" have been included as subspecies of the little chachalaca (the connection between the Guiana Shield and Atlantic forest is known from several other birds, e.g. the buff-throated woodcreeper and the yellow-green grosbeak). Both ''O. araucuan'' and ''O. squamata'' were originally described as valid species, but – without reason – changed to subspecies of ''O. guttata''. Nevertheless, they all have white scaling/spotting on the lower neck and chest, thus resembling the Amazonian nominate group (incl. "''subaffinis''"), and most recent authorities continue to treat all as subspecies of ''O. guttata''.
The Colombian chachalaca (''O. columbiana'' Hellmayr, 1906) was formerly considered a subspecies in this group, but is now recognized as a separate species by the South American Classification Committee of the AOU and the IOC.
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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