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"Rhynchotus rufescens,... is grey-brown, with blacker crown, rufous cheeks, neck, and breast, and chestnut primaries; the back is being barred with whitish and black, and the flanks with brown and white. " A. H. Evans, 1900. This bird is referenced in this source as Rhynchotus rufescens the Great Tinamou, though it's description seems to more closely resemble Rhynchotus rufescens the Red-Winged Tinamou.

Red-winged Tinamou

"Rhynchotus rufescens,... is grey-brown, with blacker crown, rufous cheeks, neck, and breast, and chestnut…