Fairly numerous in the lower Rio Grande valley and delta of Texas.

The breeding range extend from the lower Rio Grande valley of southernmost Texas to the Yucatan Peninsula of eastern Mexico, ending in northern Belize and northwestern Guatemala.

The wintering range extends from the lower Rio Grande valley up the Gulf coast and just into western Florida.

The buff-bellied hummingbird breed in forests and thickets, preferring pine-oak forest, semi-arid scrub and thickets along watercourses. Females build a next in a protected location in a scrub or tree. Both males and females aggressively defend feeding locations within his or her territory. Females lay two white eggs.

Adults are a metallic olive green above with a buff colored belly. The tail and primary wings are rufous and tail is slightly forked. The under wing is white. The throat is a metallic golden green. Red bill, straight and slender with a black tip.

Females has a dark upper bill and is less colorful than the male.

The buff-bellied hummingbird is a medium-sized hummingbird up to about four and a half inches long.

This hummingbird is partially migratory. The buff-bellied hummingbird winters in small numbers along the Gulf Coast of the United States from Texas to the Florida panhandle and travels to the Yucatan Peninsula of eastern Mexico, and as far south as northern Belize and northwestern Guatemala in Central America.

Mail buff-bellied hummingbirds have a straight, slender and red bill with a darker tip. They have a metallic olive green head, back and fore parts with a buff colored belly. The tail and primary wings are rufous in color and slightly forked. The underwing is white and the throat is a metallic golden green.

The female has a dark upper bill and are less colorful than the male.