Description wikipedia

The buff-winged cinclodes (Cinclodes fuscus) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, Chile, Paraguay, Uruguay and as a vagrant on the Falkland Islands. The buff-winged cinclodes is 15 to 19.4 cm (5.9 to 7.6 in) long and weighs 29 to 33 g (1.0 to 1.2 oz). It is a small cinclodes with a shortish bill. The sexes have the same plumage. Adults have a distinct light buffish white supercilium, dark gray-brown ear coverts with pale streaks, and a bright white malar area that flares to the rear. Their forehead is speckled, their crown dark gray-brown, and their upperparts dark brown. Their wing coverts are dark brown with wide buffish edges and their flight feathers dark fuscous with a narrow tawny-rufous band across them. Their tail's central feathers are dark brown and the rest blackish brown; the outer three pairs have progressively more pale tawny tips with the outermost of all having a tawny outer web. Their chin is white, their throat white with thin dark scallops, their breast dull pale brown with faint buff streaks, their belly whitish buff, their flanks dull brown, and their undertail coverts mottled brown and buff. Their iris is brown or dark brown, their bill dark brown to blackish whose mandible often has a paler base, and their legs and feet blackish to dark brownish. Juveniles are more richly colored than adults and have dark edges on most of their underparts' feathers.