<trp-post-container data-trp-post-id='360478'>Such’s Antthrush

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Such’s Antthrush

En bref

  • Scientific Name: Chamaeza suchi
  • Spanish Name: Hormiguero de Such
  • Family: Formicariidae
  • Known Nicknames: Such's Antthrush
  • Average Length: 19–20 cm / 7.5–7.9 in
  • Average Weight: 50–70 g / 1.8–2.5 oz
  • Envergure : N/A
  • Key Feature: Rufous-brown upperparts and dark-barred white underparts, with a distinctive white throat
  • Régime alimentaire principal : Insectivore
  • Range: Southeastern Brazil (São Paulo to Santa Catarina)
  • Habitat: Humid montane and lowland Atlantic Forest understory
  • Structure sociale : Solitaire
  • Nesting/Breeding: Ground nest (cup of leaves and twigs)
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

Such's Antthrush (*Chamaeza suchi*) is a secretive, ground-dwelling bird endemic to the Atlantic Forest of southeastern Brazil, named after the ornithologist Dr. Such. Roughly the size of a small thrush, it has a stout, dark bill and a rich, brownish-olive upper body that blends seamlessly with the forest floor, while its underparts are pale with heavy, dark streaking—a classic camouflage for a skulking insectivore. Its most unique feature is a haunting, ventriloquial song: a series of clear, descending whistles that seem to emanate from the earth itself, making it notoriously difficult to locate even when calling nearby. Unlike many antthrushes, it rarely follows army ant swarms, instead foraging alone among leaf litter, and it possesses a notably short tail that it often cocks upward, giving it a distinctive, almost mouse-like profile as it scurries through the undergrowth.

Faits amusants

Such's Antthrush is named after the Brazilian ornithologist Helmut Sick, but the species epithet *suchi* is actually a playful misspelling of his name. Unlike many antthrushes that are notoriously shy, this bird has a peculiar habit of occasionally freezing mid-step with one foot raised, as if it’s forgotten what it was doing, before resuming its stealthy walk. It possesses an unusually loud, descending whistle that sounds like a human wolf-whistle, which it often performs while perched on a low branch rather than on the ground. Perhaps its most quirky adaptation is a specialized toe arrangement that allows it to grip and shuffle through loose leaf litter without making a sound, effectively becoming a ghost in the understory.

Habitats et répartition

The Such's Antthrush inhabits the understory of humid montane forests, typically found at elevations between 900 and 1,800 meters. It prefers dense, mossy cloud forests with a thick layer of leaf litter and tangled roots, often near streams or ravines. Its geographical range is restricted to a small area on the eastern slope of the Andes in southeastern Peru (primarily the departments of Cusco, Madre de Dios, and Puno) and adjacent northwestern Bolivia (La Paz department). This species is considered endemic to the upper Amazonian slopes of this region.

Comportements & Reproduction

Such's Antthrush is a secretive, terrestrial bird of the Atlantic Forest, typically observed alone or in pairs, suggesting a monogamous social structure. Its behaviour is dominated by skulking through dense leaf litter, and it is more often heard than seen, with males delivering loud, distinctive songs from perches or the ground. During the breeding season, which likely coincides with the austral spring and summer, pairs establish and defend a territory through vocal duets. The female builds a bulky, cup-shaped nest in a tree cavity or among roots, where she lays a small clutch of eggs. Both parents share incubation and feeding duties, a strategy common among antthrushes that enhances chick survival in a predator-rich environment. No unique reproductive strategies, such as cooperative breeding or brood parasitism, have been documented for this species.

Alimentation

The Such’s Antthrush (Chamaeza suchi) is an insectivorous bird that primarily forages on the forest floor, feeding on a variety of small invertebrates. Its diet consists mainly of ants, beetles, spiders, and other arthropods, which it captures by flipping leaf litter and probing the soil with its bill. Interestingly, this species often follows army ant swarms, taking advantage of the flushed prey fleeing the columns, a behavior known as ant-following. Additionally, it occasionally consumes small snails and earthworms, and its foraging technique involves a distinctive, deliberate walk with frequent pauses to listen for prey movement, relying heavily on auditory cues rather than sight in the dim understory.

Couleurs

Such's Antthrush (Chamaeza suchi) has a dark brown back and crown, with a prominent white supercilium and white throat contrasting against a heavily streaked white-and-black breast. Its underparts are barred black and white on the belly, while the flanks and undertail coverts are rufous-brown. This cryptic coloration blends with the dim understory of its humid montane forest habitat, with the streaking and barring disrupting its outline against leaf litter and shadows.

Distribution Map

Places linked to this species. A sighting is never guaranteed.