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The Guianan puffbird ("Notharchus macrorhynchos") is a species of puffbird in the family Bucconidae. It is found in forest and woodland in north-eastern South America (and named after The Guianas), in far eastern Venezuela, north-eastern Brazil, Guyana, Suriname and French Guiana. It formerly included the white-necked puffbird (now "N. hyperrhynchus") as a subspecies. The two differ markedly in bill size ("N. hyperrhynchus" larger-billed than "N. macrorhynchos"), plumage (among other things, "N. hyperrhynchus" has less black to the flanks and more white to the forecrown than "N. macrorhynchos"), and voice. Consequently, the two were separated by SACC in 2004. As presently defined, the Guianan puffbird is monotypic.