Black Metaltail

The black metaltail is 11.5 to 12.5 cm (4.5 to 4.9 in) long and weighs about 6 g (0.21 oz). It has a medium length, straight, black bill. The adult male is overall black with a purplish or rosy gray sheen. Its slightly forked tail is iridescent bronzy gold and rosy gray on its upper side and glittering golden-orange on its underside. It has a conspicuous white spot behind the eye and its gorget is glittering turquoise green. The adult female is overall dark smoky gray with a smaller gorget than the male. Juveniles are similar to the female but without a gorget.

The black metaltail is found on the western slope of the Peruvian Andes from southern Cajamarca Department south almost to the Chilean border. It also occurs in some valleys within the Andes. Its range might extend into Chile though as of 2022 there are no records there. It inhabits montane scrublands, woodlands, and canyons, especially those with Polylepis and Puya. In elevation it ranges between 1,500 and 4,500 m (4,900 and 14,800 ft) and is most common above 2,700 m (8,900 ft).

The black metaltail feeds on nectar from a wide variety of low flowers and flowering bushes, shrubs, and trees. It also eats small insects. It usually takes nectar while hovering but will also cling to flowers and sometimes "rob" nectar by piercing the base of a flower. Males defend feeding territories.