Colibrí Estrella Dorsiverde

Identificación

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 on the head feathers and a slight buffy malar streak.

Taxonomía

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.

Nombre científico

Urochroa leucura

Autoridad

Lawrence, 1864

Orden

Apodiformes

Familia

Trochilidae

Género

Urochroa

Distribución y hábitat

The green-backed hillstar is found on the east slope of the Andes from southern Colombia through eastern Ecuador and disjunctly in northeastern Peru. It inhabits the interior and edges of mature montane forest and secondary forest, and also shrubby slopes, and is often found near streams. In Colombia and Ecuador it generally ranges between elevations of 1,600 and 2,800 m (5,200 and 9,200 ft), and is most numerous at about 1,800 m (5,900 ft). In Peru it is known only between 800 and 1,500 m (2,600 and 4,900 ft).

Migración

Resident species

Comportamiento

Though the green-backed hillstar is generally sedentary, it makes some seasonal elevational movements.<p>The green-backed hillstar usually forages in the lower and middle strata of the forest but occasionally in the canopy. Males defend feeding territories at stands of flowering vegetation. It takes nectar mostly from plants of genera Inga, Bomarea, Psammisia, and Cavendishia. In addition to feeding on nectar it captures small insects by hawking from a perch.<p>The green-backed hillstar's breeding phenology has not been documented.<p>What is thought to be the green-backed hillstar's song is "a continuous series of single 'tseee', 'tsing' or 'seeuw' notes". It also makes "a liquid 'twit', repeated in long sequences.

Conservación

Tendencia poblacional

unknown