Although the Buff-bellied hummingbird is a minor United Stated breeding species, they appear to be expanding into the coastal states as Mexican habitat is lost to agriculture. They spend most of their time in the southern states of the United States and spend their winters in eastern coastal Mexico.
Male Buff-bellied hummingbirds have a green metallic back, crown, and throat with rusty sides, belly, and tail feathers. They also have a white eye ring and weigh about 4.05 grams.
The only difference between the male and female Buff-bellied hummingbirds is that the females weigh about 3.67 grams.
Buff-bellied nests are built in low bushes, usually less than five feet off the ground.