Description wikipedia

The curve-billed reedhaunter (Limnornis curvirostris) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, and Uruguay. The curve-billed reedhaunter is 15 to 17 cm (5.9 to 6.7 in) long and weighs 27 to 30 g (0.95 to 1.1 oz). It is a small furnariid whose plumage closely resembles that of some Old World reed warblers of genus Acrocephalus. It has a long and quite decurved bill. The sexes' plumages are alike. Adults have a whitish supercilium, an ill-defined dark brown band behind the eye, lighter brown ear coverts with some thin whitish streaks, and a whitish malar area. Their crown, nape, back, rump, and uppertail coverts are rich brown; the brown is darkest on the crown and gradually becomes more rufescent to the uppertail coverts. Their wings and tail are rufescent brown. Their throat is whitish, their breast more buffy, their belly creamy buff, their flanks cinnamon-buff, and their undertail coverts a rich buff. Their iris is brown, their maxilla brown to blackish, their mandible a whitish and brownish mix, and their legs and feet grayish.