<trp-post-container data-trp-post-id='360579'>Gray-throated Warbling Finch

En bref

• Scientific Name: Microspingus cabanisi
• Spanish Name: Monterita pechicastaña
• Famille : Thraupidae
• Known Nicknames: Gray-throated Warbling-Finch, Cabanis's Warbling Finch
• Longueur moyenne : 13–14 cm / 5,1–5,5 pouces
• Average Weight: 15–20 g / 0.53–0.71 oz
• Envergure : N/A
• Key Feature: Gray throat and upper breast contrasting with white belly and rufous crown
• Primary Diet: Granivore (seeds) and Insectivore
• Range: Southern South America (central Chile, western Argentina)
• Habitat: Scrublands, open woodlands, and edges of temperate forests
• Social Structure: Often found in pairs or small groups
• Nesting/Breeding: Open cup nest in low shrubs or trees
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Gray-throated Warbling Finch (*Microspingus cabanisi*) is a striking passerine bird endemic to the Atlantic Forest of southeastern Brazil, known for its vivid, harlequin-like plumage and melodious, warbling song. This small finch measures about 12–13 cm in length and is distinguished by a bold, bright yellow body contrasted with a slate-gray throat, a black mask that extends from the eye to the nape, and a long, expressive tail that is often cocked upward. Its most unique characteristic is the species-specific vocalization—a rapid, flutelike series of notes that often ends with a distinctive buzz, which it uses to defend territories and communicate with mates. A special feature is its strong, conical beak, perfectly adapted for cracking seeds, though it also supplements its diet with small insects. Despite its beauty, this finch faces threats from habitat fragmentation and is considered a near-endemic species of conservation concern, making it a prized sighting for birdwatchers in its limited range.

Faits amusants

Despite its name, the Gray-throated Warbling Finch doesn’t just warble—it performs a bizarre “wing-flash” display during courtship, rapidly flicking one wing upward to reveal hidden white patches, a behavior rarely seen in other finches. It also has a unique foraging trick: it often hangs upside-down like a titmouse to pry loose bark for insects, a skill more common in woodpeckers than in seed-eating finches. Surprisingly, this species is a master of mimicry, incorporating calls from other birds—including predators like hawks—into its own song, possibly to startle rivals or confuse listeners.

Habitats et répartition

The Gray-throated Warbling Finch is found in subtropical and temperate montane forests, primarily inhabiting the understory and edges of humid Andean cloud forests. It also occurs in adjacent shrubby clearings, secondary growth, and forest borders, often at elevations between 1,500 and 2,800 meters. Its geographical range is restricted to the eastern slope of the Andes in central and southern Peru, extending into extreme northwestern Bolivia.

Comportements & Reproduction

The Gray-throated Warbling Finch is a socially monogamous species, typically forming stable pairs that defend a small territory during the breeding season. Pairs engage in coordinated duets and mutual preening as part of pair-bond maintenance. Their social structure outside of breeding is less rigid; they often forage in small, loose flocks of up to a dozen individuals, sometimes mixing with other finches. A unique reproductive strategy involves the male’s active role in nest construction, where he primarily gathers materials like grass and rootlets while the female shapes the cup-shaped nest, often placed low in dense shrubs. The female lays a clutch of two to three pale eggs, and both parents share incubation duties for about 12–14 days, with the male regularly feeding the female on the nest. After hatching, both parents feed the chicks a diet of insects and seeds, and the young fledge after roughly two weeks, though they remain dependent on the parents for another week. There is no documented evidence of cooperative breeding or brood parasitism in this species.

Alimentation

The Gray-throated Warbling Finch is primarily granivorous, with seeds making up the bulk of its diet, but it is also an opportunistic insectivore. It forages actively in pairs or small flocks, often on or near the ground, pecking at grass seeds, fallen grains, and small fruits. Interestingly, during the breeding season, adults shift to a higher proportion of insects and spiders to provide protein-rich food for their chicks, and they have been observed gleaning small arthropods from leaves and bark with surprising agility for a finch. Additionally, they occasionally consume nectar from flowers, though this is a minor component, and they are known to visit bird feeders in human-altered areas where sunflower seeds or millet are offered.

Couleurs

The Gray-throated Warbling Finch has a subdued yet distinctive plumage: a pale gray throat and chest contrasts with an olive-brown back and wings, while the belly is a soft whitish-buff. Its face features a subtle pale eyebrow stripe and dark lores, with no bright markings or camouflage adaptations beyond these muted, streaky tones that blend into its woodland understory habitat.