<trp-post-container data-trp-post-id='359673'>Scaled Antbird

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En bref

  • Scientific Name: Willisornis poecilinotus
  • Spanish Name: Hormiguero escamado
  • Family: Thamnophilidae
  • Known Nicknames: Common Scale-backed Antbird
  • Longueur moyenne : 11–12 cm / 4,3–4,7 pouces
  • Average Weight: 14–18 g / 0.49–0.63 oz
  • Envergure : N/A
  • Key Feature: Black and white scaled pattern on the back and nape
  • Régime alimentaire principal : Principalement insectivore
  • Range: Amazon Basin and Guianan Shield (Brazil, Colombia, Ecuador, Peru, Bolivia, Venezuela, Guyana, Suriname, French Guiana)
  • Habitat: Understory and midstory of humid lowland terra firme and várzea forests
  • Social Structure: Solitary or in pairs; often follows mixed-species foraging flocks and army ants
  • Nesting/Breeding: Small cup-shaped nest in a tree fork or palm frond
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Scaled Antbird (*Willisornis poecilinotus*) is a striking understory specialist of Amazonian forests, named for the unique, scaly pattern of black-edged white spots that adorn the throat and chest of the male, resembling polished armor. This medium-sized bird features a stout, slightly hooked bill and a rich, rufous-brown back, while females are duller with buff spotting instead of white. A special feature is its close association with army ant swarms, where it acts as an obligate follower, deftly snatching insects and small arthropods flushed by the ants—a behavior that makes it a reliable highlight for birdwatchers in its range. Its loud, descending whistled song often betrays its presence before it is seen, adding to the allure of this secretive yet charismatic antbird.

Faits amusants

The Scaled Antbird is a master of following army ant swarms, but it’s not just looking for a meal—it’s a dedicated “ant-follower” that has evolved to snatch up insects and spiders fleeing the ants, often perching just inches above the ground in a unique, almost horizontal posture to scan for prey. Its most quirky behavior is a duet-like song where the male and female alternate notes so rapidly it sounds like a single, frantic bird, yet they coordinate their calls perfectly to defend their territory. Remarkably, it also has an unusual adaptation: its feathers are coated with a special powder that deters ant attacks, allowing it to stand safely near the swarm’s chaos while other birds get bitten.

Habitats et répartition

The Scaled Antbird is primarily found in the lowland rainforests of the Amazon Basin, favoring terra firme (non-flooded) forests and occasionally adjacent humid, pre-montane slopes. It occupies dense understory vegetation, often near streams or in areas with tangled vine thickets and fallen debris. Geographically, its range extends across southern Venezuela, the Guianas, and the Brazilian Amazon, reaching into eastern Colombia, eastern Ecuador, eastern Peru, and northern Bolivia. It is generally considered resident and common within this extensive, continuous region, rarely venturing far from its preferred shaded, interior forest habitats.

Comportements & Reproduction

The Scaled Antbird is typically observed in monogamous pairs that defend small territories within the understory of lowland rainforests. Mating appears to be seasonal, with breeding activity peaking during the drier months when insect prey is more abundant. The pair jointly builds a shallow cup-shaped nest, usually placed in a concealed fork of a small tree or among palm fronds, where the female lays two white eggs with brown speckles. Both parents share incubation duties and feed the nestlings a diet of insects and spiders, with fledglings remaining dependent for several weeks. A notable reproductive strategy is the species’ strong response to army ant swarms; while this association primarily aids foraging, it may also concentrate breeding pairs in areas of high food availability, potentially increasing nest success through reduced travel time for provisioning. No evidence of cooperative breeding or extra-pair copulations has been documented for this species.

Alimentation

The Scaled Antbird (Willisornis poecilinotus) is an insectivorous bird whose diet consists almost exclusively of arthropods, with a strong preference for ants and termites, particularly army ants. It is an obligate ant-follower, meaning it relies heavily on the swarms of Eciton burchellii army ants to flush out a wide variety of prey from the leaf litter, including spiders, cockroaches, crickets, and beetles that flee the advancing ant columns. Interestingly, while it consumes many ants, it actively avoids eating the army ants themselves, instead focusing on the insects they disturb. A notable dietary fact is that this species will occasionally consume small fruits and berries, but such plant matter makes up a negligible portion of its intake, with studies showing over 95% of its stomach contents are arthropod remains.

Couleurs

The male Scaled Antbird is predominantly black with bold white scaling on the throat, chest, and belly, while the female is brown with similar but softer white scaling and a rufous crown. Both sexes have a distinctive white patch on the upper back, which is often concealed but flashed during displays. This patterning provides disruptive camouflage in the dappled light of the forest understory.

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