Small tanager approximately 12–14 cm in length, with a slender bill and striking coloration. The male has an intense chestnut-orange head, especially on the crown, nape, and sides of the head. Throat, chest, and belly bright yellow, with olive-tinged flanks. Back, wings, and tail bright olive green, with darker wings. Bill dark gray to blackish; legs grayish. The female is similar, though duller, with the head less extensively colored and partially olive-toned. Juvenile much duller and less contrasted, with a poorly defined yellowish supercilium. It may be confused with the Fulvous-headed Brushfinch (Atlapetes fulviceps), with which it coexists, although the latter is larger, more terrestrial, and shows chestnut lines bordering the yellow throat. It may also resemble the Sordid Yellow-breasted Finch (Thlypopsis sordida), especially the females, although that species mainly inhabits lower elevations of the Yungas and has a yellowish rather than orange head.
Geographic distribution: Distributed along the eastern slope of the Andes from south-central Peru, through Bolivia, to northwestern Argentina, where it occurs in the Yungas of Jujuy, Salta, Tucumán, and Catamarca. Generally between 1,700 and 2,700 m above sea level.
Habitat: Inhabits humid montane forests of the Yungas, in alder forests (Alnus acuminata) and surrounding shrublands, especially in low shrubs, dense vegetation, and Chusquea bamboo thickets. It is also found in Polylepis forests within the ecotone with high-altitude grasslands.
Diet: Primarily insectivorous. Actively searches for food in shrubs and low trees, moving rapidly through the vegetation. It obtains prey mainly from foliage, especially from the underside of leaves, and also inspects flowers, branches, and canes.
Behavior: Moves alone, in pairs, or in small groups, and frequently joins mixed-species flocks. In Tucumán, in ecotonal areas between alder forests and Polylepis woodland, it is often seen with species such as the White-browed Tit-Spinetail (Leptasthenura fuliginiceps), the Yellow Brushfinch (Atlapetes citrinellus), the Black-backed Grosbeak (Pheucticus aureoventris), and the Tucuman Mountain Finch (Compsospiza baeri) (pers. obs.). It is a very active and restless species, constantly moving among low shrubs and dense vegetation, where it often remains difficult to observe for long periods. Its song consists of a brief series of high-pitched, harsh, repeated notes; it also emits frequent soft contact calls while feeding. At the southern end of its range, it is suspected to undertake altitudinal migratory movements or seasonal southward displacements.
Nesting: Nests in shrubs and dense vegetation of the middle-lower strata. The nest is a deep cup-shaped structure built mainly with grasses, plant fibers, and fine stems. The clutch consists of 2 pale or whitish eggs, with reddish-brown spots concentrated mainly toward one pole.
Conservation status: Classified internationally as Least Concern (LC) and not threatened at the national level. It is a localized but relatively frequent species within the montane forests of the Yungas.
Author of this compilation: María Belén Dri and Diego Carús – 05/11/2026