The Blue-tailed Hummingbird (Amazilia cyanura) resides from south Mexico to Nicaragua and accidentally in Costa Rica. Its natural habits are open woodland, edges, shed in trees in coffee plantations, and young second growth. Its size is of 9 cm (3 inches) in height and 4.5 g in weight.
This bird is identical to Sleety-vented Hummingbird except secondaries rufous, with dusky tips. And its tail slightly more violet-blue. This bird pollinates flowers, especially Inga flowers.