The Green Mango feeds on insects such as beetles and flies as well as spiders, which it gleans from tree bark and leaves. It will also take nectar by probing the flower past the stamen with its long, curved bill, and will sometimes pierce the flower below the stamen to obtain nectar. The female lays two white eggs in a cup-shaped nest that is made of plant fibers and lined with lichen. Males do not incubate eggs or tend to the feeding of hatchlings, leaving this duty to the female, while standing guard on an adjacent tree branch. Mating is seen to occur from late winter to early summer. The call is an infrequently heard trill-like twitter.