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Sea slug cuts penis after mating and regrows a new one

Fact - Upon mating, one particular species of the sea slug literally cuts off its penis and regrows a new one in the next 24 hours.
Pic Credits: http://voices.nationalgeographic.com/2013/02/13/sea-slug-regrow-penis-animal-behavior-science/

Upon mating, one particular species of the sea slug literally cuts off its penis and regrows a new one in the next 24 hours.

This helps the sea slug to have a better chance of spreading its genes.

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