The calliope hummingbird (Selasphorus calliope) is a very small hummingbird native to the United States and Canada and, during winter, Central America. It was named after the Greek muse Calliope. This is the smallest breeding bird found in Canada and the United States; an adult calliope hummingbird can measure 2.8–3.9 inches in length. 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. It has been spotted in the COSA in May and August