Calliope Close-up - Selasphorus calliope - Larkspur, Colorado USA
A Calliope hummingbird -- North America's smallest bird. This beautiful male was very shy and elusive, but I finally got a close-up head shot as he peeked around the side of our feeder.
Male Calliopes have a relatively short tail and bill. The Male is green above, white below, with greenish flanks, and he has purple-red feathers on the throat that form streaks.