Yellow-browed Antbird

The yellow-browed antbird is 11 to 13 cm (4.3 to 5.1 in) long and weighs 10 to 13 g (0.35 to 0.46 oz). Adult males of the nominate subspecies have a black crown with white spots down its center. They have a bright lemon yellow supercilium and ear coverts, a black line through the eye, and a black malar "moustache". Their upperparts, sides, flanks, and tail are light grayish olive. Their flight feathers are grayish olive with white tips and their wing coverts black with white tips. Their throat and underparts are bright lemon yellow with some black streaks on the side of the breast. Adult females are similar to males but are overall paler and their crown center and wing covert tips are light buff. Subspecies H. h. ochraceiventris is larger than the nominate. It is overall somewhat browner, with paler yellow underparts, more streaking on the breast, and pale ochraceous buff flanks. Both sexes of both subspecies have a brown iris, a black maxilla, and gray legs and feet. Males have a black mandible and females a gray one.

The yellow-browed antbird has a disjunct distribution The nominate subspecies has by far the larger range of the two. It is found from the southern Colombian departments of Caquetá, Guaviare, and Vaupés south through eastern Ecuador into northern Peru. There its range extends to the Marañón River in the central north and in the northeast extends south to the Department of Ucayali. Its range extends east from Colombia and northern Peru into western Amazonian Brazil. North of the Amazon the subspecies occurs to the Negro River and south of the Amazon to the Javari and Juruá rivers. Subspecies H. h. ochraceiventris is found in Brazil south of the Amazon from the Tapajós and its tributary Teles Pires rivers east to the Xingu River. The yellow-browed antbird inhabits the understorey to mid-storey of the interior of terra firme forest and mature secondary forest. It is a bird of the lowlands, in elevation reaching only about 400 m (1,300 ft) in Colombia and Ecuador.

The yellow-browed antbird's diet is not known in detail, but it does feed on insects and spiders. Pairs forage together, moving slowly through vegetation, and usually taking prey from foliage by gleaning and by short hops and sallies. It sometimes joins mixed-species feeding flocks and occasionally attends army ant swarms.