Green-breasted Mango is a polytypic species, with five subspecies that are distributed from eastern Mexico south to Costa Rica, on a few islands in the western Caribbean, and in northwestern South America. This hummingbird is common and widespread in the Central America, but the southern populations often are local and uncommon or rare. As is typical of mangos, Green-breasted Mangos primarily occur in open lowland habitats including savannas, forest edges, parks, and gardens. Male mangos sing from high perches, repeating a twangy song three or four times in a row. When feeding on insects or nectar, these mangos frequently fan out their tails. Green-breasted Mango is very similar to Veraguan Mango (Anthracothorax veraguensis) and to Black-throated Mango (Anthracothorax nigricollis); furthermore, some subspecies currently included within Green-breasted Mango perhaps also merit recognition as separate species.