Short-tailed Antthrush

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Quick Facts

  • Scientific Name: Chamaeza campanisona
  • Spanish Name: Hormiguero colicorto
  • Family: Formicariidae
  • Known Nicknames: Short-tailed Antpitta, Campanisona Antthrush
  • Average Length: 18–20 cm / 7–8 in
  • Average Weight: 40–60 g / 1.4–2.1 oz
  • Wingspan: N/A
  • Key Feature: Short, cocked tail and stout legs
  • Primary Diet: Insectivore
  • Range: South America: Amazon Basin, Guianas, and eastern Brazil
  • Habitat: Tropical lowland and montane moist forest understory
  • Social Structure: Solitary
  • Nesting/Breeding: Ground-level cup nest in dense vegetation
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Short-tailed Antthrush (*Chamaeza campanisona*) is a secretive, thrush-like bird of South America’s humid lowland forests, renowned for its extraordinary vocalizations and elusive habits. Resembling a small, plump thrush, it sports a rich brown back, a boldly spotted white chest and throat, and a very short, often cocked tail that gives it its name. Its most special feature is its haunting, otherworldly song—a series of clear, descending whistles that sound like a bell being struck, often answered by a mate in a duet that echoes through the dense understory. Unlike many antthrushes, it rarely follows army ants, instead foraging alone on the forest floor for insects and spiders, relying on its cryptic plumage and skulking behavior to remain hidden from view.

Fun Facts

Despite its name, the Short-tailed Antthrush is a master of ventriloquism; its loud, descending whistle is so difficult to pinpoint that observers often walk in circles trying to locate the source. It possesses unusually strong legs and a peculiar habit of walking deliberately along the forest floor, often cocking its tail vertically like a wren, which is a quirky contrast to its otherwise thrush-like appearance. As a secretive skulker, it rarely flies, preferring to escape danger by running swiftly through the undergrowth, and it has a specialized adaptation in its hind toes that allows it to grip and flip over large, wet leaves with precision to uncover hidden insects and spiders.

Habitats & Distribution

The Short-tailed Antthrush is found across a broad region of South America, primarily within the Amazon Basin and the Guianan Shield. Its distribution spans eastern Colombia, southern Venezuela, the Guianas, eastern Ecuador, eastern Peru, northern Bolivia, and much of the Brazilian Amazon. It inhabits the dense understory of humid lowland and foothill forests, especially terra firme (non-flooded) forests, where it favors dark, shaded areas with abundant leaf litter and fallen woody debris. It is also known to occupy adjacent swampy or seasonally flooded forests but generally avoids open areas and forest edges.

Behaviours & Reproduction

The Short-tailed Antthrush is a solitary and terrestrial bird, typically encountered alone or in pairs. Its social structure is based on a monogamous pair bond that defends a permanent territory through loud, distinctive songs. During the breeding season, the male performs a series of vocal displays to attract and maintain contact with his mate, though elaborate physical courtship rituals are not well documented. The pair constructs a bulky, domed nest on or near the ground, often hidden in a bank or among tree roots. A unique reproductive strategy involves the female laying a single, large egg, which is incubated by both parents. This low clutch size is offset by high parental investment, with both adults sharing duties in feeding the chick and defending the nest site from predators.

Diet

The Short-tailed Antthrush is primarily an insectivorous bird, foraging on the forest floor by flipping leaf litter with its bill to uncover a variety of invertebrates. Its diet consists mainly of ants, beetles, spiders, and other small arthropods, though it also opportunistically consumes small frogs, snails, and earthworms. An interesting fact is that its name "Antthrush" is somewhat misleading, as while it does eat ants, they are not a dominant part of its diet compared to other ant-following birds; instead, it relies heavily on a generalist strategy of sifting through decaying leaves and soil. Another notable trait is its methodical, thrush-like feeding behavior, where it often pauses and tilts its head to listen for prey movement before striking, making it an auditory hunter rather than a visual one.

Colors

The Short-tailed Antthrush is predominantly a rich, dark brown above with a slightly rufous or chestnut-toned tail and wings, while the underparts are whitish to buff with dense, bold blackish-brown scaling or barring that extends from the throat to the belly. Its face features a prominent pale buff or whitish eyebrow stripe and a dark brown cheek patch. This disruptive pattern of heavy scaling on the breast and flanks provides excellent camouflage against the dappled light and leaf litter of its forest floor habitat, helping it blend into the shadowy understory.

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