The smallest bird in North America north of Mexico, the Calliope Hummingbird inhabits mountain areas of the northwestern United States. It is the smallest long-distance avian migrant in the world, spending its winters in Mexico. Its mass is about one-third that of the smallest North American warblers.
Bibliographic Citation: "Calliope Hummingbird (Selasphorus calliope)." The Cornell Lab of Ornithology All About Birds.
Citation Link Accessed 24 Jan 2014.
