The Calliope Hummingbird, Stellula calliope, is a very small hummingbird and the smallest bird found in Canada and the United States. It is the only member of the Stellula genus. These birds have glossy green on the back and crown with white underparts. Their bill and tail are relatively short. The adult male has wine-red streaks on the throat, green flanks and a dark tail. Females and immatures have a pinkish wash on the flanks, dark streaks on the throat and a dark tail with white tips. Their breeding habitat is open shrubby areas, usually at higher altitudes, in western North America from southern British Columbia and Alberta south to Colorado and southern California.

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