Description
This is the smallest breeding bird found in Canada and the United States. The only smaller species ever found in the U.S. is the Bumblebee Hummingbird, an accidental vagrant from Mexico. An adult Calliope Hummingbird can measure 7–10 cm (2.8–3.9 in) in length, span 11 cm (4.3 in) across the wings and weigh 2 to 3 g (0.071 to 0.11 oz). 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. The only similar birds are the Rufous Hummingbird and the Allen's Hummingbird, but these birds are larger with more distinct and contrasting rufous markings on tail and flanks, and longer central tail feathers.
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