Green-throated Euphonia

The green-chinned euphonia is about 10 cm (3.9 in) long and weighs 18 to 20 g (0.63 to 0.71 oz). It is a large euphonia with a short thick bill. The species is sexually dimorphic. Adult males have a small bright yellow forehead patch and blackish lores. The rest of their head, their neck, and their upperparts are glossy dark greenish blue. Their flight feathers are mostly dusky with dark greenish blue edges on the secondaries and tertials. Their tail's upper side is dark greenish blue and its underside is dark dusky gray. Their chin and upper throat are glossy dark greenish blue and their lower throat to their undertail coverts are bright yellow. Adult females have an olive crown, nape, upperparts, wings, and tail. Their face, sides of their neck, and most of their underparts are pale gray. Their chin, sides, flanks, and undertail coverts are olive-yellow. Both sexes have a dark brown iris, a bluish gray bill with a blackish tip, and dark gray legs and feet.

The green-chinned euphonia is found from Rio de Janeiro and far southern Minas Gerais states in southeastern Brazil south to central Rio Grande do Sul. From there its range extends west into eastern Paraguay between Canindeyú and Itapúa departments and into northeastern Argentina's Misiones and Corrientes provinces. The species is a bird of the Atlantic Forest. It inhabits humid forest where it favors the edges and clearings with trees and also mature secondary forest. Overall in elevation it ranges from sea level to 900 m (3,000 ft) but reaches only 500 m (1,600 ft) in Brazil.

The green-chinned euphonia feeds primarily on fruits but also includes spiders and adult and larval insects in its diet. It appears to favor the fruits of epiphytes including those of arboreal cacti. It typically forages in pairs or in small flocks of the same species, and usually high in trees. It also shares fruiting trees with other birds and regularly joins mixed-species feeding flocks.