Why do birds not fall out of trees when they sleep?

When a bird lands on a perch, these tendons tighten and so the toes lock around the perch. This involuntary reflex keeps a sleeping bird from falling off a perch. The tendons stay tight until the legs straighten. ... Falling asleep doesn't change the grip, as the weight of the bird keeps the leg in the locked position.

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the culture of the americas was influenced by the language, food, and music of africa.

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