Impressive hummingbird found in stunted cloud forest along the east slope of the Andes in southeastern Ecuador and northern Peru. Adult male is entirely dark blue and has a moderately long tail. Immature male has some green mixed into the blue plumage, and may have a buffy collar. Female is mostly green with a buffy or whitish collar, belly, and throat. Her tail is blue and shorter than male’s. This species is very localized, and prefers shorter forest and scrub near ridgelines.