The male Broad-tailed Hummingbird has a green back and red throat. He is white below with a gray-green "vest." The female this green above and white below with pale rufous on her sides.
Where you might see them
Broad-tailed Hummingbirds can be found in the south-central Rockies from Wyoming and central Idaho south to Guatemala.
The adult male makes a trilling sound with his wings that sounds like the ringing of tiny bells.