The Green Violetear is locally common in montane regions in Central and South America. It is one of four species of violetears (Colibri), all of which have a patch of elongated violet feathers on the sides of the head. The northernmost subspecies, which occurs from Mexico south to Nicaragua, often has a blue patch on the breast, and may have a blue chin. In the three other subspecies, which occur from Costa Rica south to Argentine, the chin and breast are green.

Reference:

Hobbs, Mo, M. C. Arizmendi, C. Rodríguez-Flores, and C. Soberanes-González. 2011. Green Violetear (Colibri thalassinus), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=238171