Rusty-bellied Brushfinch

The rusty-bellied brushfinch is 17 to 19 cm (6.7 to 7.5 in) long and weighs about 40 to 43 g (1.4 to 1.5 oz). The sexes have the same plumage. Adults of the nominate subspecies have a black forehead and a dark olive crown. Their face is black with a wide white lower cheek and a thin black line below the front of it. Their upperparts are lead gray; their wings and tail are slightly darker with white on the marginal coverts. Their chin is black and their throat white with a wide gray breastband below it that extends along the flanks. Voice: As of May 2026 neither xeno-canto nor the Cornell Lab of Ornithology's Macaulay Library had recordings of the rusty-bellied brushfinch's song. Excited pairs of rusty-bellied brushfinches duet with "a rapid, simple chatter". The species' calls are "a hard, rich tchi" and "a high ti".