Chestnut-bellied Euphonia

The chestnut-bellied euphonia (Euphonia pectoralis) is a species of bird in the family Fringillidae, the finches and euphonias. It is found in Argentina, Brazil, and Paraguay. == Taxonomy and systematics == The chestnut-bellied euphonia was formally described in 1801 with the binomial Pipra pectoralis, mistakenly identifying it as a manakin. The species was eventually reassigned to genus Euphonia. At the time, the genus Euphonia was a member of the family Thraupidae, the "true" tanagers. Multiple studies in the late twentieth and early twenty-first centuries resulted in Euphonia being reassigned to its present place in the family Fringillidae. The "black-throated euphonia" ("Euphonia vittata") was originally described as a species but is now believed to be a hybrid between the chestnut-bellied euphonia and the orange-bellied euphonia (E. xanthogaster). The chestnut-bellied euphonia is monotypic. == Description == The chestnut-bellied euphonia is about 11 cm (4.3 in) long and weighs 15 to 16.5 g (0.53 to 0.58 oz). It is a smallish euphonia with a stout bill. The species is sexually dimorphic. Adult males have a glossy metallic blue head, breast, and upperparts. Their flight feathers and tail are dusky with a metallic blue tinge and metallic blue feather edges. A patch of elongated…