Half-collared Sparrow

The half-collared sparrow is about 15 cm (5.9 in) long and weighs 22 to 28 g (0.78 to 0.99 oz). The species is sexually dimorphic but not dramatically so. Adult males have a black crown with a gray stripe through its middle, black lores, and a white supercilium that extends to the nape. The rest of their face is black. Their nape and the sides of their neck are gray. Their upperparts, wings, and tail are mostly greenish olive with somewhat more yellowish green on the lesser wing coverts. They have a white throat. Their underparts are mostly white with a black patch on the side of the upper breast and gray flanks. Adult females have a similar pattern to males. Female's upperparts are duller olive than male's and their throat and underparts are off-white to creamy white with a buff wash. Both sexes have a dark reddish brown iris, a black maxilla, an orange to orange-pink mandible, and grayish pink legs and feet. Juveniles have a mostly unpatterned dusky head, dark olive upperparts, and darker buffy yellow underparts than adults.

The half-collared sparrow is found in southeastern Brazil from Minas Gerais and Espírito Santo south to northeastern Rio Grande do Sul. It primarily inhabits the understory of humid montane forest and secondary forest and also occurs in shrubby fields and gardens. It reaches an elevation of 1,200 m (3,900 ft) but seldom occurs in the lowlands.

The half-collared sparrow's diet has not been studied; it is assumed to include insects, seeds, and fruits. It forages on the ground, where it scratches in leaf litter, or near the ground in low vegetation. It usually forages singly but sometimes in pairs or small family groups.