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

Sagot :

Answer:

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.

Explanation:

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