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: a very small, brightly colored American bird that has wings which beat very fast
Full Definition of HUMMINGBIRD
: any of a family (Trochilidae) of tiny brightly colored nonpasserine American birds related to the swifts that have a very slender bill and an extensible tongue for sipping nectar and that usually hover rather than perch when feeding
Allen's hummingbird (Selasphorus sasin)—Arvil L. Parker
Any of about 320 species of New World birds (family Trochilidae), many of which have glittering colours and elaborately specialized feathers. They are most abundant in South America, though about 12 species are found in the U.S. and Canada. Hummingbirds range in length from slightly more than 2 in. (5 cm) to 8 in. (20 cm), weigh 0.07–0.7 oz (2–20 g), and have a long, slender bill. The bee hummingbird of Cuba is the smallest living bird. Hummingbirds can fly forward, straight up and down, sideways, and backward and can hover in front of flowers to obtain nectar and insects. Smaller species can beat their wings as fast as 80 beats per second.