From PBS Eons.

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While the evolution of the butthole was a major breakthrough in animal development, its story might actually end with redefining what it means to have a butthole at all.

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References:
https://docs.google.com/document/d/1yaOepBtg6D3CdjGwSJdIj0NRp7pLm2ZTZeDQMtvMuZU/edit?usp=sharing