Ochre-rumped Antbird

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Quick Facts

Endemic
  • Scientific Name: Drymophila ochropyga
  • Spanish Name: Hormiguero de dorso rufo
  • Family: Thamnophilidae
  • Known Nicknames: Ochre-rumped Antwren
  • Average Length: 12–13 cm / 4.7–5.1 in
  • Average Weight: 10–14 g / 0.35–0.49 oz
  • Wingspan: N/A
  • Key Feature: Bright ochraceous rump contrasting with black-and-white streaked plumage
  • Primary Diet: Insectivore (primarily ants and other arthropods)
  • Range: Southeastern Brazil (from Minas Gerais to Rio Grande do Sul)
  • Habitat: Understory of humid montane Atlantic Forest, especially bamboo thickets
  • Social Structure: Monogamous pairs or small family groups
  • Nesting/Breeding: Cup-shaped nest built in low vegetation or bamboo
  • Conservation Status: Near Threatened (NT)
  • Population Trend: Decreasing

The Ochre-rumped Antbird (*Drymophila ochropyga*) is a striking, insectivorous passerine endemic to the Atlantic Forest of southeastern Brazil, named for its most distinctive feature: a vivid, warm ochre-colored rump and lower back that contrasts sharply with its otherwise dark, streaked body. Males are predominantly black with bold white streaks on the underparts and a white-spotted black throat, while females are browner above with a buffy, streaked chest. A specialist of dense bamboo thickets and humid undergrowth, this skulking bird is far more often heard than seen, emitting a sharp, accelerating series of whistles. Its unique adaptation to foraging within tangled bamboo stems, combined with its restricted range and reliance on intact forest, makes it a prized sighting for birdwatchers and a key indicator of healthy Atlantic Forest habitat.

Fun Facts

The Ochre-rumped Antbird engages in a peculiar "tail-flashing" display, where it fans its rufous tail feathers and flicks them sideways, likely to startle insect prey into movement or communicate with mates. Unlike many antbirds that strictly follow army ants, this species is a more independent forager, often gleaning insects from bamboo stalks and dead leaves in a methodical, almost acrobatic manner, sometimes hanging upside-down like a titmouse. Its song is a distinctive, descending series of thin, whistled notes that sound like a slow, melancholy sigh, earning it the local nickname "the sad piper" among some birders.

Habitats & Distribution

The Ochre-rumped Antbird is endemic to the Atlantic Forest of southeastern Brazil. Its geographical range extends primarily from the state of Espírito Santo south through Rio de Janeiro, São Paulo, and into northeastern Paraná. It inhabits the understory and lower mid-story of humid montane and lowland forests, particularly favoring areas with dense bamboo thickets and tangled vine growth. It is most commonly found at elevations between 200 and 1,200 meters, though it can occur higher in some locations, and it generally avoids severely degraded or open habitats, requiring relatively intact forest structure.

Behaviours & Reproduction

The Ochre-rumped Antbird is typically monogamous, with pairs defending a shared territory year-round. Their social structure is centered on the mated pair, which cooperates in all aspects of breeding. Courtship involves the male following the female with rapid wing quivers and soft vocalizations, often while she forages. Unique to this species is a cooperative breeding strategy rarely observed in antbirds: pairs are sometimes assisted by a single helper, usually a male from a previous brood. The female builds a deep cup nest in bamboo or thick undergrowth, where she lays two eggs. Both parents incubate for approximately 17 days and feed the nestlings, with the helper assisting in provisioning fledglings for up to several weeks after they leave the nest.

Diet

The Ochre-rumped Antbird is an insectivorous specialist, foraging almost exclusively for a variety of arthropods gleaned from the understory and mid-story of its humid forest habitat. True to its "antbird" name, it is an obligate follower of army ant swarms, particularly those of the genus *Eciton*, where it snatches fleeing insects, spiders, centipedes, and other invertebrates that the ants flush from the leaf litter. Unlike some larger antbirds, it does not eat the ants themselves but relies on the chaos they create. Interestingly, this species often forages in mixed-species flocks, allowing it to exploit a broader range of prey by following other birds to ant swarms and disturbed foliage, and it has been observed performing "leaf-gleaning" and "sally-striking" maneuvers to capture prey flushed by its own movements or those of its flock mates. Its diet is notably low in fruit, with plant material comprising a negligible portion of its intake.

Colors

The Ochre-rumped Antbird has a dark gray to blackish head and upperparts, with bold white streaks on the crown, back, and wing coverts. Its most distinctive feature is the bright ochre-rufous rump and lower back, contrasting sharply with the black tail. The underparts are pale gray to white, heavily streaked with black, providing camouflage in the dappled light of its understory habitat.

Distribution Map

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