the humming birds are exclusive in the sense that?
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Hummingbirds are the only birds that can fly backwards. ... A hummingbird's wings flap at a rate of about 80 times per second and its tiny heart beats more than 1000 times per minute. This is why they must consume relatively large quantities of food.
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Hummingbirds are the only birds that can fly backwards. ... A hummingbird's wings flap at a rate of about 80 times per second and its tiny heart beats more than 1000 times per minute. This is why they must consume relatively large quantities of food.
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