Green-backed Hillstar

The green-backed hillstar (Urochroa leucura), formerly included in the white-tailed hillstar, is a species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae. It is found in Colombia, Ecuador, and Peru. == Taxonomy and systematics == The green-backed hillstar and what is now the rufous-gaped hillstar (Urochroa bougueri) were once treated as a single species, the "white-tailed hillstar". (BirdLife International's Handbook of the Birds of the World retains the "white-tailed" name for the present species.) They are the only two members of their genus. Although they share the name "hillstar" with the members of genus Oreotrochilus, they are quite different and not closely related. The green-backed hillstar is monotypic. == Description == The green-backed hillstar is 13 to 14 cm (5.1 to 5.5 in) long including its approximately 3 cm (1.2 in) bill. It weighs about 8.7 g (0.31 oz). The sexes are alike, though the female is somewhate duller than the male. They have bronzy green upperparts with bronzy uppertail coverts, an iridescent blue throat and breast, and a dull gray belly. Their central tail feathers are bronzy and the others white with dusky gray outer edges. Juveniles are similar to adults with the addition of buffy fringes…