Facts about Hummingbird

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Hummingbirds are birds native to the Americas.
Hummingbirds measures 7.5–13 cm (3–5 in) in length.
The smallest extant hummingbird species is the 5 cm (2.0 in) bee hummingbird, which weighs less than 2.0 g (0.07 oz).
The largest hummingbird species is the 23 cm (9.1 in) giant hummingbird, weighing 18–24 grams (0.63–0.85 oz).
Hummingbirds split from their sister group, the swifts and treeswifts, around 42 million years ago (Mya).
The common ancestor of extant hummingbirds is estimated to have lived 22 Mya in South America.
They are known as hummingbirds because of the humming sound created by their beating wings, which flap at high frequencies audible to humans.
The wing-flapping rates, vary from around 12 beats per second in the largest species to around 80 per second in small hummingbirds.