Description wikipedia

The bronze-green euphonia (Euphonia mesochrysa) is a species of bird in the family Fringillidae, the finches and euphonias. It is found in Bolivia, Colombia, Ecuador, and Peru. The bronze-green euphonia is 9 to 10 cm (3.5 to 3.9 in) long and weighs 12 to 15 g (0.42 to 0.53 oz). It is a rather drab euphonia with a thick stubby bill. The species is sexually dimorphic. Adult males of the nominate subspecies have a bright yellow forehead with a thin dark olive band below it. Their mid-crown is olive, their rear crown grayish, and their nape and the rest of their face olive. Their upperparts are olive with a strong gray-blue gloss. Their upperwing coverts are olive-green and their primary coverts blackish. Their flight feathers are dusky with yellow-green edges on the outer ones and olive-green edges on the rest. The upper side of their tail is dusky olive and the underside dark gray. Their throat, chest, and sides are yellowish olive and the rest of their underparts deep ochre-yellow. Adult females have an olive forecrown and mid-crown, and a strongly gray-tinged hindcrown and nape. The rest of their face is olive. Their upperparts, wings, and tail are like the male's. Their throat, chest, and upper breast are olive-yellow, the center of their lower breast and their belly light gray, and their sides, flanks, and undertail coverts olive-yellow. Males of subspecies E. m. media are everywhere darker than the nominate, with a wider yellow forehead and more yellow on the underparts. Females are also darker than the nominate. E. m. tavarae males have a slightly paler forehead than the nominate, with a wider dark band below it, a darker and more olive throat, and a less orange-tinted belly. Both sexes of all subspecies have a dark brown iris, a blackish maxilla, a mostly bluish gray mandible, and dark gray legs and feet.