Bronze-tailed plumeleteer

The bronze-tailed plumeleteer (Chalybura urochrysia) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is found in Colombia, Costa Rica, Ecuador, Nicaragua, and Panama.

The bronze-tailed plumeleteer is 10.5 to 12 cm (4.1 to 4.7 in) long. Males weigh about 7.1 g (0.25 oz) and females about 6.1 g (0.22 oz). Both sexes of all subspecies have a black maxilla and tip of the mandible; the rest of the mandible is dull pink to dark red. Males of the nominate subspecies have metallic green upperparts and glittering green underparts, with long fluffy white undertail coverts. Their tails are bronze-green. Females are also metallic green above but gray below with green flecks on the side. Their undertail coverts are grayish white and their outer tail feathers tipped with gray. Immature birds resemble the adults with buffy to cinnamon fringing on the feathers of the crown, nape, and rump.

Males of subspecies C. u. melanorrhoa have darker green upperparts than the nominate, with purplish bronze uppertail coverts. Their underparts are darker with a dusky bronze belly and shorter, sooty blackish, undertail coverts. Their tail is purplish black. Females are a darker gray below than the nominate and have more green flecking. Males of subspecies C. u. isaurae have a blue throat and breast, a bluish green belly, and a brighter bronze tail than the nominate. Females have pale gray underparts with little or no green flecks.