Endemic to Peru, Bronze-tailed Comet is widespread but uncommon, and remains a surprisingly poorly known hummingbird. This comet occupies arid scrub and woods in montane areas, on the Pacific slope of the Andes and in dry Andean valleys. The plumage of this comet is relatively plain; overall it is dingy bronzy green, paler and grayer below, with a rosy gorget. The tail is moderately long, longer in the male, is distinctly forked, and has a bronzy green uppersurface. Almost nothing has been published on the natural history of Bronze-tailed Comet.