Description: High-Andean siskin measuring 11–13 cm, with a black hood that extends onto the upper chest and continues onto a black back that, at close range, shows fine yellow-green edging. The rump is intensely yellow and very visible in flight. Underparts entirely yellow from the lower chest to the undertail coverts, a key feature distinguishing it from the Black Siskin (S. atratus), which is black on the front half. Wings black with a yellow band at the base of the flight feathers forming a clear panel on the folded wing. Tail black with yellow bases on the outer rectrices. Female similar but duller, with a brown-blackish hood and back and overall greener tones. Juvenile duller gray-brown, with streaking on the chest and flanks and paler yellow tones.

Geographical distribution: Andes from central Peru and western Bolivia, along the central Andes of Chile and south into north-central Argentina between 2,000 and 3,700 m, reaching up to 5,000 m in some Andean regions. In Argentina it breeds mainly in the cordillera of Mendoza and Neuquén. It performs altitudinal descent and seasonal movements, with part of the population moving northward and appearing in northwestern provinces.

Habitat: High-Andean shrublands and quebradas with sparse low vegetation, rocky slopes, areas with Senecio and shrublands, and also low Polylepis woodlands. Occasionally found along streams and in exposed rocky areas.

Behavior: Found in pairs during the breeding season and in small groups or mixed flocks outside of it. Confiding in open areas, often perching on rocks or atop shrubs in sunny sites. Joins flocks with Black Siskins and other siskin species.

Diet: Primarily seeds, flower heads, and shoots of composites, with occasional insects. Feeds on the ground, among grasses, and on shrubs, often hanging acrobatically.

Reproduction: Builds a cup-shaped nest made of dry fibers, small twigs, wool, and feathers, placed in shrubs, herbaceous clumps, or rocky crevices. Usually lays three eggs. The female incubates.

Conservation status: Not threatened nationally or globally.

Authors of this compilation: Diego Carus and Maria Belén Dri – 06/12/2025