Childbirth is taxing for animals too, but most of the problems with human birth is our huge heads, our heads are really, really difficult to give birth too. Animals have much smaller heads which makes it easier for them to give birth, and whatever damage they suffer is generally less debilitating than ours, but it also depends on the animal, a chicken dosent have the same problems a deer will have for example, an egg dosent have hoofs that can tear the deer for example.
Also animals have an intense survival instinct and will try to run even if they are severly hurt so its difficult to say, a zebra will run with its guts hanging out, a human wont.
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