Orange-bellied Euphonia

The orange-bellied euphonia is 9 to 11 cm (3.5 to 4.3 in) long and weighs 9 to 16 g (0.32 to 0.56 oz). It has a thick stubby bill. The species is sexually dimorphic. Adult males of the nominate subspecies E. x. xanthogaster have a deep yellow forehead; the patch extends to well beyond the eye. The rest of their head and their nape are glossy blackish. Their upperparts, wing coverts, and flight feathers are glossy blue-black. The upper side of their tail is blue-black and the underside gray with white inner webs on the outer two to three pairs of feathers. Their throat is purplish black. Voice: The orange-bellied euphonia's song has some regional differences but their significance has not been studied. In Ecuador it has been described as "a variable, almost random-sounding, series of semimusical phrases given in a leisurely manner" and its calls as "a clear ding-ding-ding, a chee!, an upslurred kueé, and a more gravely cheeur-cheeur".