[ELI5] How do baby birds just know that they need to break free from their eggs, which would be the only place they have ever known?

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The weirdest part is, they all seem to just lie there helpless and tired after they become free. Is it a food driven urge that drives them? Do they suddenly gain a sense of self confidence?

In: Biology

Instinct. Same as why a baby sea turtle crawls to the ocean, or a baby duck follows it’s Mom around or any mammal that knows to suck on it’s mother’s teet for milk.

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They get too big and uncomfortable so they stretch, move, eventually the egg cracks. Keep it simple.