Hummingbirds are small, colorful birds with shining and many different colors feathers. They flap their wings so fast (about 80 times per second) that they make a humming noise.
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From @greenotech
Hummingbirds are small, colorful birds with shining and many different colors feathers. They flap their wings so fast (about 80 times per second) that they make a humming noise.