Rare and endangered hummingbird found in the Andes of southwestern Colombia. Accessing its tiny known range is difficult, and only a few intrepid and lucky birders have seen one. Male looks quite dark, but has a glittering blue throat bordered on both sides by iridescent green as well as white leg puffs and a blue vent. Female is mostly green with a buffy tinge to the underparts, faint whisker marks, and smaller leg puffs; she is similar to female Glowing Puffleg, but typically has a fainter throat patch and less buff on the neck. Inhabits stunted cloud forest at high elevations.