The White-tailed Emerald (Elvira chionura) lives in Costa Rica and Panama. It frequents humid mountain forests, semi-open, shaded gardens. Males more in canopy, and females more in understory. Its size is of 7.5 cm (3 inches) in length and 3.2 g in weight.
Above is bronzy-green, shading to dark coppery-bronze on upper tail-coverts and central retrices. Below mostly glittering green, with belly and crissum white. Bill black, except pink lower half, and feet dark gray. Lives in groups and visits flowers of epiphytes, trees, shrubs, and bananas.