<trp-post-container data-trp-post-id='360606'>Rufous-capped Antshrike

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En bref

  • Scientific Name: Thamnophilus ruficapillus
  • Spanish Name: Batará capirrufo
  • Family: Thamnophilidae
  • Known Nicknames: Rufous-capped Antshrike
  • Average Length: 14–15 cm / 5.5–5.9 in
  • Average Weight: 18–24 g / 0.63–0.85 oz
  • Envergure : N/A
  • Key Feature: Rufous crown and upperparts contrasting with black-and-white barred underparts in males
  • Régime alimentaire principal : Principalement insectivore
  • Range: Southeastern Brazil, eastern Paraguay, northeastern Argentina, and Uruguay
  • Habitat: Understory of humid Atlantic Forest, forest edges, and secondary growth
  • Social Structure: Monogamous pairs or solitary
  • Nesting/Breeding: Open cup nest in a tree fork or shrub
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Rufous-capped Antshrike (*Thamnophilus ruficapillus*) is a striking neotropical bird, easily identified by its namesake feature: a vivid, chestnut-rufous crown that contrasts sharply with its otherwise gray body in males, while females boast a warmer, brownish-rufous cap and a buffy underside. A member of the antbird family, this species is a master of dense undergrowth, where it uses its stout, hooked bill to glean insects and spiders from tangled vines. Its unique behavior includes a distinctive, nasal duet between mates—a series of accelerating "kwa-kwa" notes that echo through the bamboo thickets and humid foothill forests of the Andes from Venezuela to Argentina. Unlike many antshrikes, it thrives in secondary growth and forest edges, making it a resilient and charismatic ambassador of its challenging habitat.

Faits amusants

Despite its bold, chestnut cap, this bird is a master of invisibility; it often freezes mid-motion for minutes, tilting its head to mimic a broken branch while scanning for prey. Males and females perform a synchronized duet so tightly timed it sounds like a single bird, a trick used to defend territory in dense thickets. It has an unusual habit of following army ant swarms not for the ants, but to snatch insects and small lizards flushed by the chaos, sometimes even riding on the backs of larger birds to get a better vantage point.

Habitats et répartition

The Rufous-capped Antshrike is found in the central and southern regions of South America, primarily within the southern cone. Its distribution spans from southeastern Brazil (including the states of São Paulo, Paraná, and Rio Grande do Sul) through Uruguay, and into central and eastern Paraguay, as well as northeastern Argentina (especially in the provinces of Misiones, Corrientes, and Entre Ríos). It inhabits dense undergrowth in a variety of forested environments, including subtropical and temperate forests, forest edges, secondary growth, and gallery forests along rivers. It is also commonly found in humid lowland forests and montane woodlands, typically staying close to the ground within tangled thickets and vine-filled areas.

Comportements & Reproduction

The Rufous-capped Antshrike is typically monogamous, with pairs defending a territory year-round. During the breeding season, which varies by region but often coincides with the rainy season, the male performs a simple courtship display involving wing-flicking and soft calls to the female. Both sexes participate in building a deep, cup-shaped nest, usually placed in a fork of a branch in dense undergrowth. The female lays two to three eggs, which are incubated primarily by her for about 14 to 16 days, though the male may take short shifts. Both parents feed the chicks, which fledge after roughly 12 to 14 days. A unique reproductive strategy is cooperative breeding, where young from a previous brood sometimes remain with the parents to help defend the territory and feed subsequent nestlings, increasing the survival rate of the new brood. The social structure is thus based on stable, family-group territories, with limited dispersal of offspring until they can establish their own pair bond.

Alimentation

The Rufous-capped Antshrike is primarily an insectivore, with its diet heavily focused on a variety of arthropods. It forages actively in the dense understory, gleaning prey such as beetles, caterpillars, ants, spiders, and grasshoppers from leaves and branches, often as part of mixed-species feeding flocks. An interesting fact about its diet is that it occasionally consumes small fruits and berries, particularly during the non-breeding season when insect prey may be less abundant. Additionally, this species employs a unique foraging technique known as "leaf-pulling," where it uses its stout, hooked bill to grab and tug at dead curled leaves, snapping them open to expose hidden spiders and insects inside.

Couleurs

The male Rufous-capped Antshrike has a solid rufous crown and nape contrasting with a black face, throat, and upper breast, while its back, wings, and tail are black with bold white spots and barring; the female replaces black with warm brown and rufous, with a paler, streaked underside. Both sexes have a stout, hooked bill, and their disruptive black-and-white or brown-and-buff patterns serve as camouflage in dappled forest understory light.

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