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Hummingbirds are birds native to the ( Americas, Amsterdam, India, Africa ). They are the smallest of birds, most species measuring ( 7.5–13 cm, 9.5-13cm, 13cm ) in length. The smallest extant bird species is the 5 cm bee hummingbird.
They are known as hummingbirds because of the humming sound created by their ( beating wings, rubbing foot, fliping the tail, rotating the head ), which flap at high frequencies audible to humans.
Most ( North American, North Indian, North Austrialian, North China ) hummingbirds migrate southward in fall to spend winter in ( Mexico and Central America., Canada, Philipines, Saudi Arabia )
For nutrition, hummingbirds eat a variety of insects, including mosquitoes, fruit flies, gnats in flight or aphids on leaves and spiders in their webs.