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Creatures don't evolve to limit themselves, though. That's the antithesis of evolution.
The thing is, we really don't have to worry (mostly) about the large head size that humans have (in regard to the birth canal) because we've learned to work around it.
If we humans had not been messing with our own evolution, then slowly the genes that allowed for women to have such small birth canals would have been weeded out of the population and the only reproduction would be folks with big heads/their big-hipped mamas and folks with small heads and their mamas.
sapienza
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