<trp-post-container data-trp-post-id='363237'>Buff-throated Warbling Finch

En bref

• Scientific Name: Microspingus lateralis
• Spanish Name: Chirigüe de garganta anteada
• Famille : Thraupidae
• Known Nicknames: Red-rumped Warbling Finch, Buff-throated Warbling-Finch
• Longueur moyenne : 13–14 cm / 5,1–5,5 pouces
• Average Weight: 13–18 g / 0.46–0.63 oz
• Envergure : N/A
• Key Feature: Buff-colored throat contrasting with gray head and chestnut back
• Primary Diet: Primarily Granivore (seeds) and Insectivore
• Range: Southeastern Brazil (from Minas Gerais and Espírito Santo to Rio Grande do Sul) and adjacent northeastern Argentina
• Habitat: Montane and lowland Atlantic Forest edges, secondary growth, and scrub
• Social Structure: Social, often found in pairs or small flocks
• Nesting/Breeding: Cup-shaped nest in shrubs or low trees
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : Stable

The Buff-throated Warbling Finch (*Microspingus lateralis*) is a lively songbird of Brazil’s Atlantic Forest, distinguished by its warm, cinnamon-buff throat that contrasts sharply with a crisp white belly and subtle grey-brown upperparts. Its most unique characteristic is a long, expressive tail often cocked upward, which it flicks while foraging in small, noisy flocks for seeds and insects. A special feature is its complex, warbling song—a rapid, musical trill that echoes through the understory, making it easier to hear than see. With a slender, pointed bill and a bold white eyebrow stripe, this finch combines delicate beauty with energetic social behavior, thriving in forest edges and clearings.

Faits amusants

Despite its name, the Buff-throated Warbling Finch is a master of ventriloquism; males can throw their complex, fluting song in different directions without moving their heads, making it nearly impossible for predators or birders to pinpoint their location. It also exhibits a quirky "wing-flicking" display during courtship, where it rapidly flutters one wing while hopping sideways, a behavior thought to signal fitness or distract rivals. An interesting adaptation is its use of its slightly curved bill to expertly pry open the tough seed pods of the cerrado's native grasses, a skill that allows it to exploit a food source many other finches cannot access.

Habitats et répartition

The Buff-throated Warbling Finch inhabits the Atlantic Forest biome of southeastern South America, primarily found in lowland and montane forests, forest edges, and secondary growth. It favors humid, dense understory vegetation and bamboo thickets, often near watercourses. Its geographical range extends from southeastern Brazil (from southern Bahia south through Espírito Santo, Rio de Janeiro, and São Paulo) into northeastern Argentina (Misiones province) and eastern Paraguay. It is generally resident within this region, occurring from sea level up to approximately 1,500 meters in elevation.

Comportements & Reproduction

The Buff-throated Warbling Finch is a highly social species, typically found in monogamous pairs or small family groups that defend a territory year-round. During the breeding season, which coincides with the austral spring and summer, the male performs a conspicuous courtship display involving fluffed plumage, rapid wing fluttering, and a series of melodic, warbling songs delivered from a prominent perch. The female constructs a compact, cup-shaped nest of fine grasses and spider webs, often placed in a dense shrub or low tree. She alone incubates the clutch of two to three pale, speckled eggs for approximately 12–14 days, while the male actively defends the territory and brings food to the nest. Both parents feed the altricial nestlings, and a unique reproductive strategy is the species’ tendency to engage in cooperative breeding: offspring from previous broods occasionally remain to assist in feeding and defending subsequent clutches, increasing fledging success in resource-scarce environments.

Alimentation

The Buff-throated Warbling Finch is primarily granivorous, with seeds forming the bulk of its diet, though it also consumes insects and small arthropods, especially during the breeding season to provide protein for chicks. An interesting fact is that it forages both on the ground and in low vegetation, often in small, noisy flocks, and has been observed gleaning seeds from grass heads and picking insects from leaves with quick, precise movements. Additionally, it shows a seasonal shift in diet, relying more heavily on fruits and berries when available, particularly during the non-breeding months.

Couleurs

The Buff-throated Warbling Finch has a distinctive pale buff throat and chest, contrasting with a gray head and a bold white supercilium. Its upperparts are olive-brown, while the belly is whitish with faint, variable dark streaking on the flanks. Unique markings include a blackish malar stripe bordering the buff throat, and the wings show subtle pale wing bars. This coloration provides camouflage in its grassy and shrubby understory habitat, with the buff tones blending into dried vegetation and leaf litter.