[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?


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.


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