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Hummingbirds are birds from the Americas that constitute the family Trochilidae. They are among the smallest of birds most species measuring 7.5–13 cm in length. Indeed the smallest extant bird species is a hummingbird the 5 cm bee hummingbird weighing less than 2.5g.

They are known as hummingbirds because of the humming sound created by their beating wings which flap at high frequencies audible to humans. They hover in mid-air at rapid wing-flapping rates typically around 50 times per second allowing them also to fly at speeds exceeding 15 m/s.

Hummingbirds have the highest metabolism of any homeothermic animal. To conserve energy when food is scarce and nightly when not foraging they go into torpor a state similar to hibernation slowing metabolic rate to 1/15th of its normal rate.

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