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Hummingbirds are birds from the Americas. They constitute the family Trochilidae. At 7.5–13 cm (3–5 in) long, they among the smallest of birds in the world. Indeed, the smallest existing bird today is the bee hummingbird, which weighs less than 2.0 g (0.07 oz).
These birds take their name from the sound they create when their wings flap at high frequencies. When they hover in mid air, their wing-flapping frequencies vary from around 12 beats per second in the largest species, to in excess of 80 bps in some of the smallest. Of those species that have been measured in wind tunnels, their top speed exceeds 15 m/s. Some species can dive at speeds in excess of 22 m/s (or 49 mph).