Bay-chested Warbling Finch

The bay-chested warbling finch (Castanozoster thoracicus) is a species of bird in the family Thraupidae. It is endemic to southeastern Brazil. Its natural habitats are temperate forests and subtropical or tropical moist montane forests. == Taxonomy == The bay-chested warbling finch was formally described in 1835 by the Finnish naturalist Alexander von Nordmann from a specimen collected in Brazil. He coined the binomial name Fringilla thoracica. This species was traditionally placed in the genus Poospiza. A molecular phylogenetic study published in 2014 found that the genus was polyphyletic. In the subsequent reorganisation the bay-chested warbling finch was moved to its own newly erected genus Castanozoster. The name combines the Ancient Greek καστανό meaning "chestnut" with ζωστήρ meaning "belt". The bay-chested warbling finch is monotypic: no subspecies are recognised. == Description == The bay-chested warbling finch is a rather dainty, warbler-like finch, measuring 13.5 cm long on average and with an average weight of 11–12.8 g. Males have gray upperparts, getting progressively browner from the head to the tail. The grayish upper-wing displays a white flash when the wings are closed, created by the white edges and bases of the outer primaries. The anterior edge of the wings is also white…