<trp-post-container data-trp-post-id='359544'>Sharp-billed Treehunter

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En bref

  • Scientific Name: Heliobletus contaminatus
  • Spanish Name: Trepatroncos piquiagudo
  • Family: Furnariidae
  • Known Nicknames: Sharp-billed Treehunter
  • Average Length: 14–15 cm / 5.5–5.9 in
  • Average Weight: 16–20 g / 0.56–0.71 oz
  • Envergure : N/A
  • Key Feature: Slender, sharply pointed bill with a slightly upturned lower mandible
  • Régime alimentaire principal : Principalement insectivore
  • Range: Southeastern Brazil to eastern Paraguay and northeastern Argentina
  • Habitat: Montane and lowland Atlantic Forest, especially in bamboo thickets
  • Social Structure: Solitary or in pairs, often joining mixed-species flocks
  • Nesting/Breeding: Tree cavities or holes in dead trees
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : En baisse

The Sharp-billed Treehunter (*Heliobletus contaminatus*) is a small, elusive bird endemic to the Atlantic Forest of southeastern Brazil, Argentina, and Paraguay, renowned for its remarkably thin, needle-like bill—its most distinctive feature—which it uses to expertly pry bark and probe into tree crevices for insects and spiders. About the size of a sparrow, it has a subdued yet handsome appearance: olive-brown upperparts, a pale supercilium (eyebrow stripe), and a whitish throat streaked with dark brown, blending seamlessly into a buffy, streaked belly. A unique specialist, this bird often joins mixed-species foraging flocks, creeping along branches and trunks like a nuthatch, and its loud, sharp *chak* call betrays its presence in the dense canopy, making it a prized sighting for birdwatchers despite its cryptic nature.

Faits amusants

Despite its fierce name, the Sharp-billed Treehunter is a master of stealth, often hanging upside-down like a tiny acrobat while meticulously peeling bark from branches to extract hidden insects, a behavior more reminiscent of a nuthatch than its typical ovenbird relatives. It possesses a uniquely long, decurved bill that is not only sharp but surprisingly flexible at the tip, allowing it to probe into the tightest crevices of moss and lichen. This bird also engages in a quirky “wing-flicking” display when agitated, rapidly snapping its wings against its body to produce a faint, mechanical rattle that is thought to startle prey or signal alarm to its mate.

Habitats et répartition

The Sharp-billed Treehunter inhabits the understory and mid-levels of humid montane evergreen forests, as well as mossy cloud forests and mature secondary growth, typically between 700 and 2,200 meters in elevation. It favors areas with dense epiphyte loads and bamboo thickets, often near streams or ravines. Its geographical range is restricted to the Atlantic Forest of southeastern Brazil, extending from southern Bahia south through Espírito Santo, Rio de Janeiro, São Paulo, Paraná, and Santa Catarina, with isolated populations also found in northeastern Argentina (Misiones) and extreme eastern Paraguay.

Comportements & Reproduction

The Sharp-billed Treehunter is generally solitary or observed in pairs, especially during the breeding season, and does not form large social flocks. Mating appears to be monogamous for the season, with pairs defending a small territory within the dense understory of montane forests. Reproduction involves a unique strategy: the species is a facultative cooperative breeder, where young from a previous brood may remain to assist the parents in feeding and defending the nest. The nest itself is a domed structure woven from moss and rootlets, placed in a tree cavity or epiphyte clump. Clutch size is typically two eggs, and both parents, sometimes with helpers, share incubation and chick-rearing duties, which may enhance fledgling survival in resource-poor highland habitats.

Alimentation

The Sharp-billed Treehunter is an insectivorous bird, with its diet consisting almost exclusively of arthropods gleaned from tree bark and epiphytes. Interesting facts about its feeding strategy include a highly specialized foraging technique where it uses its uniquely sharp, slightly upturned bill to probe into crevices and pry loose bark flakes, behaving much like a woodcreeper despite being an ovenbird. It often joins mixed-species foraging flocks, allowing it to exploit a wider range of prey by following larger birds that flush insects from hiding. Its prey includes a variety of beetles, spiders, caterpillars, and other small invertebrates, and it is known to occasionally consume small fruits or seeds, though this is a minor component of its primarily carnivorous diet.

Couleurs

The Sharp-billed Treehunter has predominantly olive-brown upperparts and paler, streaked yellowish-brown underparts, with a distinct pale supercilium and dark eyestripe. Its throat is whitish, and the wings and tail show subtle rufous edges. This plumage provides effective camouflage against tree bark and moss in its montane forest habitat, with no bright or contrasting markings.

Distribution Map

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