Black-Striped sparrow

En bref

• Scientific Name: Arremonops conirostris
• Spanish Name: Pinzón conirrostro
• Family: Passerellidae
• Known Nicknames: None
• Average Length: 16.5 cm / 6.5 in
• Average Weight: 28–41 g / 1.0–1.4 oz
• Wingspan: 23–25 cm / 9.0–9.8 in
• Key Feature: Grey head with broad black lateral crown stripes and olive-green upperparts
• Primary Diet: Omnivore (Seeds, insects, and small berries)
• Range: Central and South America (Honduras to western Ecuador, northern Brazil, and Venezuela)
• Habitat: Dense thickets, forest edges, and second-growth scrub
• Structure sociale : Solitaires ou en couples
• Nesting/Breeding: Large, domed cup nest placed on or near the ground
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Black-Striped Sparrow (*Arremonops conirostris*) is a robust and striking songbird native to the humid lowlands and scrublands of Central and South America. Easily identified by its bold namesake feature—thick black stripes running across a slate-grey crown—this large sparrow sports a vibrant olive-green back and wings, contrasted by a pale grey underbelly and a subtle, distinctive flash of yellow at the bend of its wing. Unlike many reclusive sparrows, this species is a charismatic presence in tropical gardens and thickets, often seen hopping through leaf litter with a flicking tail as it forages for insects and seeds. Its most enchanting trait is its rhythmic, melodic song, which typically begins with slow, deliberate whistles before accelerating into a spirited trill, echoing through the undergrowth as a testament to its lively nature.

Faits amusants

Known for their distinctive "bouncing ball" song, these birds produce a series of whistles that accelerate into a rapid trill. They are architectural outliers among sparrows, constructing large, oven-like domed nests with side entrances hidden low in dense vegetation rather than simple open cups. While foraging, they exhibit a quirky "double-scratch" hop to uncover insects in the leaf litter, often working in pairs to defend their territory year-round. Most impressively, they are tireless performers, frequently continuing their vocal displays through the sweltering midday heat when most other tropical species have retreated into silence.

Habitats et répartition

This species inhabits the dense undergrowth of humid to semi-humid thickets, bushy pastures, and the edges of second-growth forests. It is frequently encountered in agricultural landscapes, such as coffee plantations and overgrown clearings, where it favors low-lying tangled vegetation for nesting and foraging. The geographical range extends from eastern Honduras southward through Central America, including Nicaragua, Costa Rica, and Panama. In South America, the distribution continues across northern Colombia and northern Venezuela, reaching as far south as the Pacific lowlands of western Ecuador.

Comportements & Reproduction

These birds are primarily terrestrial and are typically observed in pairs or small family groups, foraging through leaf litter for insects and seeds. They maintain year-round territories, which they defend vigorously using a series of sharp, metallic songs. During the breeding season, they form monogamous bonds and exhibit a secretive nature while navigating their dense, shrubby habitats to avoid detection by predators. Reproduction involves the construction of a distinctive, bulky domed nest made of grass and leaves, featuring a side entrance and usually situated low in a bush or directly on the ground. The female typically lays two white eggs, which she incubates for approximately two weeks. While the female handles the majority of the incubation, both parents are highly involved in feeding and protecting the nestlings. A key survival strategy is the careful concealment of the nest deep within thickets or tall grass to provide camouflage and protection from brood parasites like cowbirds.

Alimentation

The Black-striped sparrow maintains an omnivorous diet that primarily consists of a variety of seeds, small fruits, and insects such as beetles, grasshoppers, and spiders. This species is predominantly a ground-feeder, often found foraging in leaf litter or low-lying vegetation where it utilizes a distinctive double-scratch technique—hopping forward and then quickly kicking back with both feet to uncover hidden prey. Interestingly, these birds are known to follow army ant swarms, not to eat the ants themselves, but to opportunistically snatch up the various invertebrates that are flushed out of hiding by the moving column. They typically forage in pairs or small family groups, meticulously scouring the undergrowth for seasonal berries and fallen seeds to supplement their protein intake.

Couleurs

The Black-striped sparrow is characterized by a grey head marked with bold, parallel black stripes across the crown and through the eyes. Its upperparts are a cryptic olive-green that blends into dense foliage, while the underparts are pale grey to white. A distinctive splash of bright yellow at the bend of the wing serves as a key field mark against its otherwise muted, earthy plumage and stout black bill.