Description wikipedia

The scrub euphonia (Euphonia affinis) is a species of bird in the family Fringillidae, the finches and euphonias. It is found from Mexico to Costa Rica. The scrub euphonia is about 10 cm (3.9 in) long. It weighs 8.5 to 12.8 g (0.30 to 0.45 oz). It has a short stubby bill. The species is sexually dimorphic. Adult males of the nominate subspecies have a small yellow forecrown; the color extends just to the eye. The rest of their head and nape are glossy blue-black with a purplish sheen. Their upperparts are glossy blue-black. Their tail is mostly blackish with white inner webs on the outer two pairs of feathers. Their upperwing coverts and flight feathers are blackish with some dark blue gloss. Their chin and throat are glossy blue-black with a purplish sheen and their breast, belly, and undertail coverts are bright yellow. Adult females have an olive-yellow forehead, a grayish crown and nape, and an olive-yellow face. Their upperparts, wings, and tail are olive with a gray tinge on the back. Their underparts are mostly olive-yellow with a yellow belly and undertail coverts. Males of subspecies E. a. olmecorum are like the nominate. Females are overall paler than the nominate. Their rump, uppertail coverts, and the edges of their tail feathers are greener. Their underparts are more grayish and their belly a duller yellow. Both sexes of both subspecies have a dark brown iris, a black maxilla with a grayish base, a light bluish gray mandible with a blackish tip, and dark gray legs and feet.