<trp-post-container data-trp-post-id='360554'>Salvadori’s Antwren

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En bref

  • Scientific Name: Myrmotherula minor
  • Spanish Name: Hormiguerito de Salvadori
  • Family: Thamnophilidae
  • Known Nicknames: Salvadori's Antwren
  • Average Length: 9–10 cm / 3.5–4 in
  • Average Weight: 8–10 g / 0.28–0.35 oz
  • Envergure : N/A
  • Key Feature: Male has black throat and upper breast, white underparts with black streaks; female is buffy below with a white throat
  • Régime alimentaire principal : Principalement insectivore
  • Range: Southeastern Brazil (Espírito Santo to Santa Catarina) and northeastern Argentina (Misiones)
  • Habitat: Lowland and montane Atlantic Forest understory
  • Social Structure: Usually found in pairs or small family groups
  • Nesting/Breeding: Cup-shaped nest built in a tree fork
  • Statut de conservation : Vulnérable (VU)
  • Évolution démographique : En baisse

The Salvadori's Antwren (*Myrmotherula minor*) is a tiny, elusive songbird endemic to the Atlantic Forest of southeastern Brazil, where it is a specialist of bamboo thickets. This insectivore measures just 9–10 cm (3.5–4 inches) and is distinguished by its striking sexual dimorphism: males are a smart charcoal-gray with a black bib and a crisp white throat, while females are a warm, tawny-brown with pale underparts. Its most unique characteristic is its strong, almost exclusive association with bamboo, using its slender bill to glean insects from leaves and stems in the dense understory. A special feature is its distinctive, high-pitched song—a rapid series of sharp, metallic notes—which is often the only clue to its presence in the tangled bamboo, as its small size and cryptic coloration make it a challenge to spot. Due to severe habitat loss, this antwren is now globally threatened, making every sighting a precious glimpse into a vanishing ecosystem.

Faits amusants

Despite its name, Salvadori’s Antwren is not particularly small for an antwren, but it compensates with a bizarre social quirk: it is a compulsive follower of army-ant swarms, but unlike many antbirds that snatch fleeing insects, this species often darts in to steal prey directly from the mouths of other birds, a behavior called kleptoparasitism. It also has a peculiar “wing-flicking” display—a rapid, asymmetrical flutter of one wing while singing—that may startle hidden insects into moving. Males and females look nearly identical, a rarity among antwrens, and they often forage upside-down, hanging from vines like a tiny acrobat to probe leaf-undersides for spiders and katydids.

Habitats et répartition

Salvadori's Antwren inhabits humid lowland and foothill forests, primarily within the Atlantic Forest biome. It is found in the understory and midstory of mature primary and well-structured secondary forests, often near streams or in areas with dense vine tangles. Its geographical range is restricted to southeastern Brazil, occurring from southern Bahia and Minas Gerais south through Espírito Santo, Rio de Janeiro, and into eastern São Paulo. The species is considered locally rare and patchily distributed, with most records concentrated in protected reserves within this narrow range.

Comportements & Reproduction

Salvadori's Antwren exhibits a monogamous social structure, typically forming stable pairs that defend small territories year-round within the understory of humid Atlantic Forest. Mating habits are poorly documented but are assumed to involve courtship feeding and duetting, with the male often following the female closely during the breeding season. The species builds a cup-shaped nest placed in a branch fork, where the female lays two white eggs with reddish-brown speckles. Both parents share incubation and feeding duties, and the young fledge after approximately 11–13 days. No unique reproductive strategies have been observed beyond standard biparental care, though cooperative breeding has been suggested in some related antwrens but not confirmed for this species.

Alimentation

Salvadori's Antwren (Myrmotherula minor) is an insectivorous bird whose diet consists almost exclusively of small arthropods, primarily insects and spiders. Foraging actively in the understory and mid-canopy of humid lowland forests, it gleans prey from the undersides of leaves, branches, and mossy trunks, often as part of mixed-species flocks. An interesting fact about its diet is that it specializes in capturing tiny, soft-bodied insects like caterpillars, leafhoppers, and beetles, and it has been observed to favor the larvae of certain moths that feed on epiphytic plants. Despite its name "antwren," it does not follow army ants to feed on flushed prey, unlike many other antbirds; instead, it relies on its own meticulous searching, and its high metabolic rate requires it to feed almost continuously throughout the day to sustain its energy needs.

Couleurs

Salvadori's Antwren (Myrmotherula minor) has a gray head and upperparts, with white underparts and a distinctive black throat and upper breast in males, while females show a pale throat. Both sexes have white wing bars and a short tail, with no notable camouflage adaptations; their subtle gray-and-white pattern blends into dappled light in the forest understory.

Distribution Map

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