The Snowy-bellied Hummingbird’s clean white belly and its green chest are diagnostic within its range. Males sing by themselves from perches within trees or shrubs, generally away from flower patches.

Reference:

Sedgwick, Carolyn W.. 2011. Snowy-bellied Hummingbird (Amazilia edward), 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=255096