The Chestnut-bellied Euphonia forms a superspecies with the Golden-sided Euphonia; both species possess golden feather tufts on their shoulders and are distinguished by the belly color, which is black in Golden-sided. As the name implies, euphonias are good singers. Chestnut-bellied Euphonia is quite an exception to the name, since its vocal repertoire seems to be largely made up by a series of harsh notes resembling the calls of allied species. The bulk of its distribution is encompassed by the southern portion of the Atlantic Forest in Argentina, Paraguay and Brazil. It is not known to migrate and is commonly encountered in mixed species flocks together with Green-throated, Golden-rumped, Violaceus, and Purple-throated Euphonias.