Solving the mystery of the four-headed echidna penis

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Aside from being an egg-laying mammal, the echidna is unique amongst other mammals because of its four-headed penis. How does it work? New research shows that it functions like a pair of two-headed penises; its urethra and erectile tissue split, so only one side of the penis is erect at a time, depending on which side gets more blood. Scientists speculate they evolved this way so they can ejaculate more often, increasing their chances of spreading their genes.
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