Buff-browed foliage-gleaner

The buff-browed foliage-gleaner (Syndactyla rufosuperciliata) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

It is found in Argentina, Bolivia, Brazil, Ecuador, Paraguay, Peru, and Uruguay.

The buff-browed foliage-gleaner is 17 to 18 cm (6.7 to 7.1 in) long and weighs 22 to 33 g (0.78 to 1.2 oz). It is a medium-sized furnariid with a thick, slightly upcurved, bill. The sexes have the same plumage. Adults of the nominate subspecies S. r. rufosuperciliata have a tawny-buff eye ring and a lighter supercilium that extends to the nape; the rest of their face is brownish with small buff markings. Their crown is dull olive-brown with vague whitish streaks at the rear, and their back, rump, and uppertail coverts are plain olive-brown. Their tail is dull rufous and their wings are rich olivaceous brown. Their throat is whitish with some brownish feather tips, their breast buffy whitish with olive-brown feather edges that give a scalloped appearance, their belly olive-brownish with wide blurry buffy-whitish streaks that disappear towards the rear, their flanks a darker olive-brownish with fewer streaks, and their undertail coverts olive-brownish with ochraceous-tinged streaks. Their iris is brown to dark brown, their maxilla brown to black, their mandible whitish to blue-gray, and their legs and feet olive to brownish gray. Juveniles are similar to adults but have spotted rather than streaked underparts.

Subspecies S. r. acrita has a slightly paler supercilium than the nominate, browner and more olivaceous upperparts, a more chestnut tail, and more prominent streaking on the belly. S. r. oleaginea has more olivaceous brown underparts than the nominate, and the underparts' streaks are thinner and longer. S. r. cabanisi compared to the nominate has a richer ochraceous supercilium, a darker crown, a richer brown back, a chestnut wash on the uppertail coverts, a more buff-tinged throat, and richer more ochraceous underparts with tawny-buff streaking.