Description wikipedia

The rufous-bellied euphonia (Euphonia rufiventris) is a species of bird in the family Fringillidae, the finches and euphonias. It is found in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela. The rufous-bellied euphonia is about 10 cm (3.9 in) long and weighs 13 to 18 g (0.46 to 0.63 oz). It is a smallish euphonia with a stout bill. The species is sexually dimorphic. Adult males of the nominate subspecies have a dark steel-blue head, throat, chest, and upperparts. Their flight feathers and tail are dusky with a steel-blue tinge and steel-blue feather edges. They have a patch of golden-yellow pectoral feathers that is usually hidden under the wing. Their underparts below the chest are mostly orange that is somewhat golden-yellow on the sides. Adult females have a mostly darkish olive head with a yellowish tinge on the forehead, a grayish tinge on the nape, a yellowish chin, and a gray throat. Their upperparts, wings, and tail are darkish olive. Their underparts are mostly gray with olive-yellow sides and flanks and tawny undertail coverts. Males of subspecies E. r. carnegiei have darker blue upperparts and darker tawny lower underparts than the nominate. Females are overall darker than the nominate with more olive sides and flanks. They also often have a weak metallic blue gloss on the upperparts. Both sexes of both subspecies have a dark brown iris, a pale blue-gray bill with a black tip to the mandible, and dark gray legs and feet.