Is This the Theory That Has More Support?

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One theory is that the mouth and anus grew out of the same original whole. But a lot of animals seem to have like a pretty old body plan. Instead, they express different genes around each of their holes. This suggests that they might have appeared at different points in evolutionary time. There are also other theories for how anases could have evolved.

Once upon a time, there were no anuses. These ingenious organs allowed our primordial ancestors to grow bigger and more complex, but scientists still don’t understand how they evolved. And they’re still grasping at a mystery that literally surrounds it: Why is the human butt so big?

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