Description: A 13–15 cm Andean seedeater. Male: uniformly lead-gray, lacking eyebrow and eyering; head and upperparts slate-gray; underparts light gray, only slightly paler than the back. Wings and tail dark brownish-black with grayish edges. Bill conical, dark gray-black; legs dark. Female: grayish-brown above with dense streaks on crown, back, and chest; underparts whitish but always streaked on chest, flanks, and abdomen. Juvenile: similar to the female, duller and browner. Compared with the Small Sierra Finch (G. plebejus), the Plumbeous is larger, lacks eyebrow, lacks streaked back, and has more uniform plumage; the Small Sierra Finch is smaller, with white eyebrow, streaked back, and whitish belly. Females: Plumbeous female is heavily streaked even on the abdomen; Small Sierra Finch female shows a clean abdomen. Compared with the Great Sierra Finch (Idiopsar brachyurus), the latter is much larger, has a thick, long, straight bill, and is scarce with a more restricted distribution in the northwest.

Geographical distribution: Occurs along the Andes from Venezuela to Chile and Argentina, reaching Tierra del Fuego. One of the most widely distributed Andean species. In Argentina it occupies the entire Andes, the central sierras of Córdoba and San Luis, and high areas of the Yungas. Ranges from 50 to 4,500 m (higher in the north, lower in the south). Mostly resident, with altitudinal migrations; in Patagonia it descends markedly in winter.

Habitat: Puna, Patagonian steppes, ravines, rocky slopes, high grasslands, scattered shrublands, Andean hillsides, sierras, and edges of wetlands or peatlands. Also common in degraded and overgrazed environments.

Behavior: Fairly terrestrial and tame. Alone or in pairs, also in groups; often associates with sierra finches, ground-finches, siskins, and other yales. Forages for seeds on the ground and perches on rocks or low shrubs. Song is sweet and descending.

Diet: Mainly seeds; also shoots and fruits. During breeding season, consumes more arthropods to feed nestlings.

Reproduction: Nest made of twigs, hair, and feathers, placed in rocky crevices, cliffs, embankments, or among stones. Lays 2–3 light blue eggs with brown spots.

Conservation status: Not considered threatened. Very common throughout its wide range.

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