Small hummingbird usually found in fairly open dry habitats or forest edges in western Ecuador and Colombia, from 600–1,800 m but locally higher in Andean valleys. Males are entirely shimmering emerald green with dark blue tail. Short straight bill. Females green above and pale gray below with dark cheek and white line behind eye. Both sexes are extremely similar to Blue-tailed Emerald but no range overlap. Otherwise unlikely to be confused given small size and plumage. Typically seen singly feeding at lower or middle levels in gardens or edges; visits feeders.