The Critically Endangered Colorful Puffleg is confined to a tiny number of lower-montane forest localities on the west slope of the West Andes in Colombia. It is a strikingly beautiful hummingbird. The male has a glittering green frontlet and gorget, a blue belly, and red and coppery-gold undertail-coverts, with large white leg ‘puffs’ fringed in cinnamon. The upperside of the forked tail is bronzy, while the underside is coppery-gold. In contrast, the female is dark shining green above with a white median throat and underparts, and indistinct reddish, golden, and bluish spots on belly, flanks and undertail. The bronze-green tail is tipped blackish and the leg ‘puffs’ are much smaller. Because of the relatively small number of certain field observations of this undoubtedly rare bird, very little is known of the species’ biology and behavior, although it seems to feed in both the understory and at mid levels.