Black-chested Sparrow

The black-chested sparrow (Peucaea humeralis) is a species of bird in the family Passerellidae, the New World sparrows. It is endemic to Mexico. == Taxonomy and systematics == The black-chested sparrow was formally described in 1851 with the binomial Haemophila humeralis. It was later reassigned to genus Aimophila. Genus Peucaea had earlier been merged into Aimophila; in 2010 taxonomic systems began restoring Peucaea to generic status and moved the black-chested sparrow and several other species from Aimophila to it. The black-chested sparrow is monotypic. == Description == The black-chested sparrow is 15 to 15.5 cm (5.9 to 6.1 in) long and weighs about 18 to 28 g (0.63 to 0.99 oz). The sexes have the same plumage. Adults have a mostly blackish head with a white spot on the lores and a white "moustache". The black of their head extends under their white throat to form a band across the chest. Their scapulars and back are rufous with darker brown mottling and their rump and uppertail coverts are olive-brown. Their tail is blackish brown with paler brown feather edges. Their wings are also blackish brown with paler brown feather edges, except that the greater coverts have white tips that show…