About Casiornis rufus (Vieillot, 1816)
The rufous casiornis (Casiornis rufus (Vieillot, 1816)) measures 17 to 18 cm (6.7 to 7.1 in) in length and weighs 22 to 27 g (0.78 to 0.95 oz). Males and females have identical plumage. Adult individuals have rufous colored heads, upperparts, wings, and tails. Their throat and breast are cinnamon, with a whitish patch on the center of the throat. Their belly is pale buffy yellowish. They have dark brown irises, a dark bill with a pinkish base, and blackish gray legs and feet. Rufous casiornis are distributed from southeastern Peru southward through most of Bolivia and Paraguay, reaching northern Argentina as far as Tucumán and Corrientes provinces, and extending slightly into northern Uruguay. Their range reaches eastward into Brazil, with its eastern boundary roughly running through central Rondônia, central Pará, western Piauí, southern Minas Gerais, and southern Mato Grosso do Sul. This species has also been recorded as a vagrant in Chile. The rufous casiornis lives in a variety of wooded landscapes, including deciduous woodlands, gallery woodlands, wooded cerrado, and scrubby and wooded Chaco. It has been documented in dry forest in parts of Peru. In Brazil, it occurs at elevations from near sea level up to 1,500 m (4,900 ft). In Bolivia, it can locally reach elevations of 2,500 m (8,200 ft).
