Batara à nuque noire

En bref

  • Scientific Name: Thamnophilus atrinucha
  • Spanish Name: Batará coroninegro
  • Family: Thamnophilidae
  • Known Nicknames: Western Slaty Antshrike, Black-crowned Antshrike
  • Longueur moyenne : 13–14 cm / 5,1–5,5 pouces
  • Average Weight: 18–25 g / 0.63–0.88 oz
  • Envergure : N/A
  • Key Feature: Male has black crown and nape contrasting with gray upperparts and white underparts; female has rufous crown and yellowish underparts
  • Régime alimentaire principal : Principalement insectivore
  • Range: From southeastern Mexico south through Central America to western Ecuador and northwestern Venezuela
  • Habitat: Lowland and foothill tropical moist forests, forest edges, and secondary growth
  • Social Structure: Usually seen in pairs or small family groups
  • Nesting/Breeding: Cup-shaped nest placed in a fork of a tree or shrub, often low to the ground
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Black-crowned Antshrike (*Thamnophilus atrinucha*) is a striking, medium-sized passerine bird of the Neotropics, renowned for its bold sexual dimorphism and aggressive ant-following behavior. Males are a crisp, slate-gray with a solid black crown and a distinctive white patch on the wing coverts, while females are a warm, rich chestnut-brown with a rufous crown and a similarly patterned wing. A special feature is its hooked, powerful bill, perfectly adapted for snatching large insects, spiders, and even small lizards that flee from army ant swarms. Unlike many shy forest birds, this antshrike is notably vocal and pugnacious, often perching conspicuously in the understory and responding aggressively to intruders with a loud, churring call, making it a charismatic and easily observed highlight of lowland forests from Honduras to western Ecuador.

Faits amusants

Despite its bold black-and-white male plumage, the Black-crowned Antshrike is a master of stealth, often joining mixed-species foraging flocks and mimicking the calls of other birds to avoid detection by predators. It has a quirky habit of dangling upside-down like a titmouse while gleaning insects from leaf undersides, and pairs perform a synchronized duet where the male’s sharp “kree-ah” is answered instantly by the female’s softer “chew-chew,” reinforcing their lifelong bond. Their nest is a deep, hanging pouch woven from spiderwebs and plant fibers, which they often decorate with lichen for camouflage, and both sexes will feign a broken wing to lure intruders away from their eggs.

Habitats et répartition

The Black-crowned Antshrike is found from eastern Panama through western and northern Colombia, into western Ecuador, and also in northwestern Venezuela. Its habitat consists primarily of the understory and edges of humid lowland and foothill forests, up to around 1,200 meters in elevation. It also inhabits second-growth woodlands, tall scrub, and forest clearings with dense, tangled vegetation, often near watercourses. This species avoids the interior of dense, mature rainforest, preferring areas with a thick layer of shrubs and vines where it can forage for insects.

Comportements & Reproduction

The Black-crowned Antshrike is a socially monogamous, territorial bird that typically forms stable pairs defending a home range year-round. Males and females jointly sing duets to maintain contact and advertise territory boundaries, with the male initiating a slow, nasal call and the female answering with a faster, higher-pitched series. Nesting duties are shared: both sexes build a deep, cup-shaped nest suspended in a branch fork using rootlets and fungal rhizomorphs, usually placed 1-3 meters high in dense undergrowth. The female lays two white eggs with brown speckles, and both parents incubate for about 16 days. After hatching, the adults feed the nestlings insects and small vertebrates for around 11 days until fledging. A unique reproductive strategy is their cooperative defense against brood parasites, such as the Striped Cuckoo; pairs aggressively mob and sometimes physically remove parasitic eggs or chicks from the nest. Post-fledging, the young remain with the parents for several weeks, learning foraging techniques, before dispersing to establish their own territories.

Alimentation

The Black-crowned Antshrike is an insectivore that primarily forages in the understory of humid lowland forests, where it consumes a wide variety of arthropods, including beetles, caterpillars, ants, spiders, and orthopterans like crickets and katydids. An interesting fact about its diet is that, despite its name, it rarely eats adult ants; instead, it specializes in gleaning prey from leaves and branches using a distinctive upward-jabbing motion of its bill. Another notable behavior is its occasional consumption of small fruits and berries, which supplements its mainly insect-based diet, especially during the non-breeding season when insect availability may fluctuate.

Couleurs

The male Black-crowned Antshrike is mostly black with a prominent white patch on the scapulars (shoulders) and white-tipped wing coverts, while the female is rufous-brown above with a buffy breast and darker, blackish crown. Both sexes have a stout, hooked bill and a distinct white stripe above the eye. Their dark, streaky plumage provides effective camouflage in the dappled light of dense understory vegetation.