The species is partially migratory, occupying its breeding range in northeastern Mexico (southwestern Tamaulipas and eastern San Luis Potosí to southern Veracruz and extreme western Tabasco) from late February through September. Other movements are poorly understood, but the wide separation of populations in South America suggests a species-wide propensity to travel and/or a more continuous distribution during periods when South America's climate was warmer and drier.

Young birds are responsible for the majority of occurrences in the United States. The first Green-breasted Mango documented north of Mexico was photographed in coastal Texas in September 1988. The species has since become an increasingly frequent vagrant and extremely rare resident in the lower Rio Grande Valley of southern Texas.

The species inhabits tropical deciduous forest, open landscapes with scattered large trees, orchards, gardens, and cultivated areas, but its distribution is spotty and often localized.

Like all hummingbirds, it feeds on insects and other invertebrates and nectar. Prey is often taken in mid-air but may also be gleaned from vegetation or stolen from spider webs (a behavior known as kleptoparasitism). Favorite nectar sources include the flowers of large trees such as Inga, Erythrina, and Ceiba or kapok.

The female Green-breasted Mango lays two white eggs in a tiny cup nest on a high, thin, and usually bare, branch. The exterior of the nest is camouflaged with chips of lichen and other plant fragments. Incubation by the female is 16 to 17 days, and the nestling period last another 24.

At a Green-breasted Mango nest on San Andrés Island (Caribbean), it was noted that the tree was beset with Pseudomyrmex stinging ants. This was also noted at a Black-throated Mango nest in Cuyabeno Faunistic Reserve, Ecuador. It is likely that the ants would deter predators, but it is not known whether the birds deliberately select such trees for nesting.

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