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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