Fulvous-vented Euphonia

The fulvous-vented euphonia is 9 to 10 cm (3.5 to 3.9 in) long and weighs about 10 to 13 g (0.35 to 0.46 oz). It is a small euphonia. The species is sexually dimorphic. Adult males of the nominate subspecies have a small lemon-yellow forehead; the patch extends to just above the eye. The rest of their crown and their face, nape, throat, chest, and upperparts are glossy blue-black. Their flight feathers are dusky with a blue-black tinge. The upper side of their tail is blue-black and the underside dark gray with white inner webs on the outer two pairs of feathers. Voice: The fulvous-vented euphonia's song is "1–3 soft, chattery rattles followed by 1–2 short, complex and squeaky phrases that rise in pitch, e.g. du, d’u’u’u-d’u’u’u spze’e’t’tic, spze’e’t’tic...du’u, d’u’u’u-d’u’u’u’ spze’e’t’tic... and so on".