Striking hummingbird with an extremely long tail. The Male is mostly emerald green with a blue-green throat and long forked tail. The Female is much different, with a shorter tail, spotted throat, buffy belly, and short white moustache stripe. Primarily found on the east slope of the Andes from Venezuela to Bolivia, in foothills and subtropical zones from 1,200–2,500 m. Occurs within cloud forest and at edges; visits feeders. Male is superficially similar to trainbearers but notes different habitats.