<trp-post-container data-trp-post-id='360433'>Rufous-capped Antthrush

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En bref

  • Scientific Name: Formicarius colma
  • Spanish Name: Hormiguero cabecirrufo
  • Family: Formicariidae
  • Known Nicknames: Rufous-capped Ant-thrush
  • Average Length: 18–19 cm / 7.1–7.5 in
  • Average Weight: 30–42 g / 1.1–1.5 oz
  • Envergure : N/A
  • Key Feature: Rufous crown and nape contrasting with dark olive-brown body
  • Régime alimentaire principal : Insectivore
  • Range: Amazon Basin and the Guianas, south to northern Bolivia and central Brazil
  • Habitat: Humid lowland and foothill forests, often near streams
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Ground-level cavity or under tree roots
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Rufous-capped Antthrush (*Formicarius colma*) is a secretive, ground-dwelling bird of the Amazon and Atlantic Forests, renowned for its striking appearance and elusive behavior. It sports a bold rufous-orange crown and nape that contrasts sharply with its otherwise dark olive-brown body, slate-gray throat, and blackish face, giving it a hooded look. A unique characteristic is its thrush-like posture—often seen walking deliberately on the forest floor with its tail cocked—and its preference for skulking in dense undergrowth, making it far more often heard than seen. Special features include a loud, haunting whistle that rises in pitch, used to defend its territory, and a powerful, slightly curved bill adapted for flipping leaf litter to uncover insects and spiders, its primary prey.

Faits amusants

Despite its name, the Rufous-capped Antthrush is a notoriously poor flyer, often preferring to run rapidly through the undergrowth like a tiny, feathered mouse. It possesses a peculiar "ant-following" behavior, not just eating ants but specializing in scouring the chaotic swarms for other fleeing insects and spiders that the ants flush out. To communicate in the dense forest floor, it produces a haunting, descending whistle that sounds eerily like a human lament, with pairs often duetting in perfect, alternating rhythm.

Habitats et répartition

The Rufous-capped Antthrush inhabits the humid lowland and foothill forests of the Amazon basin and the Guianas. Its primary habitat is the dense, dark understory of terra firme (non-flooded) forests, where it is often found near streams or swampy areas with abundant leaf litter. Geographically, its range extends from eastern Colombia, Venezuela, and the Guianas south through eastern Ecuador, Peru, and northern Bolivia, and across much of the Brazilian Amazon.

Comportements & Reproduction

Highly secretive and usually solitary, the Rufous-capped Antthrush is primarily encountered alone or in pairs. Its social structure is based on a monogamous pair bond that likely defends a small territory year-round. Mating habits are poorly documented due to its dense understory habitat, but males are known for their loud, far-carrying songs, which serve to attract a mate and delineate territory boundaries. Reproduction involves constructing a bulky, domed nest with a side entrance, often placed in a root cavity or on a low bank. The female typically lays two white eggs, which both parents incubate and care for. A unique reproductive strategy is its remarkable nest sanitation; adults are known to eat the fecal sacs of nestlings to remove scent evidence, reducing the risk of predation by visually or olfactory hunting predators in the leaf litter.

Alimentation

The Rufous-capped Antthrush is an insectivorous bird that forages almost exclusively on the forest floor, using its strong legs to shuffle through leaf litter in a characteristic "walking" manner rather than hopping. Its diet consists primarily of a wide variety of arthropods, including ants, beetles, spiders, cockroaches, millipedes, and termites, which it captures by flipping over dead leaves and probing the soil. An interesting fact is that, despite its name, it does not exclusively follow army ant swarms like some other antbirds; instead, it is a solitary and methodical hunter, often remaining motionless for long periods before snatching prey. Additionally, it has been observed occasionally consuming small snails and earthworms, and it will glean insects from low-hanging vegetation or fallen logs, but it rarely, if ever, takes fruit or seeds.

Couleurs

The Rufous-capped Antthrush has a rich rufous crown and nape contrasting with a black face, throat, and upper breast. Its upperparts are dark olive-brown, while the lower breast and belly are white with bold black scaling, and the flanks are rufous. This underside pattern provides disruptive camouflage in the dim understory, breaking up its outline among leaf litter and shadows.

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