Golden-bellied Starfrontlet

The golden-bellied starfrontlet is about 10.9 cm (4.3 in) long including its 3.0 cm (1.2 in) bill. Males weigh an average of 6.6 g (0.23 oz) and females 6.4 g (0.23 oz). Both sexes have a white spot behind the eye. Males have a blackish crown with a glittering green forehead. Their upper back is shining dark green that transitions through greenish copper to the golden orange rump. The throat and breast are glittering green and the throat has a small violet patch. The rest of the underparts are variable, from glittering copper to reddish gold. The slightly forked tail is golden bronzy green. The female's forehead is plain green; the rest of the upperparts are colored like the male's but are duller. The throat is plain buff and has green spots on its sides. The breast is mottled buff and green. The rest of the underparts are mostly cinnamon with a reddish gold belly and a coppery gold vent area. The tail feathers are bronze and sometimes have buff tips.

The golden-bellied starfrontlet is found in the Eastern Andes of Colombia between Boyacá Department and the Metropolitan Area of Bogotá. The species primarily inhabits the interior and edges of humid montane forest. It also occurs in dwarf forest and more open landscapes with scattered vegetation. In elevation it ranges from 1,400 to 3,200 m (4,600 to 10,500 ft).

The golden-bellied starfrontlet gathers nectar from tubular flowers, usually at low to medium heights. It primarily feeds by trap-lining, visiting a circuit of flowering plants. In addition to feeding on nectar it captures small arthropods by gleaning from foliage, hovering, and by hawking.