Hummingbird Feeding From Flower Of Bean Vine Royalty-Free Stock Photography

Hummingbirds are birds native to the Americas and constituting the biological family Trochilidae. They are the smallest of bird. They are known as hummingbirds because of the humming sound created by their beating wings, which flap at high frequencies audible to humans. Hummingbirds have the highest mass-specific metabolic rate of any homeothermic animal. To conserve energy when food is scarce, and nightly when not foraging, they can go into torpor, a state similar to hibernation, slowing their metabolic rate to 1/15th of its normal rate.