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Channel-billed toucan
The channel-billed toucan (''Ramphastos vitellinus'') is a near-passerine bird which breeds in Trinidad and in tropical South America as far south as southern Brazil and central Bolivia.
==Taxonomy==
The subspecies were previously considered separate species, but all interbreed freely wherever they meet. These are the yellow-ridged toucan (''R. culminatus''; now ''R. vitellinus culminatus''), the citron-throated toucan (''R. citreolaemus''; now ''R. vitellinus citreolaemus'') and the Ariel toucan (''R. ariel''; now ''R. vitellinus ariel''). However, the subspecies ''R. v. ariel'' is closer to ''R. v. culminatus'' than to the nominate, and are by some already considered close to distinct species status. As ''R. v. ariel'' was described before ''R. v. culminatus'', if separated they would become ''Ramphastos ariel ariel'' and ''R. a. culminatus''. There also exists an isolated population in eastern Brazil. It looks very similar to, and has traditionally been considered part of, ''R. v. ariel'', but molecular analysis suggests that it has been isolated for a long time and is a yet-undescribed separate subspecies or possibly even species (Weckstein, 2005).
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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