Barnacles go to great lengths for sex

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Unlike animals that travel long distances to breeding grounds under a wide range of conditions barnacles reproduce by extending impressively long penises to find and fertilize distant mates.
Unlike animals that travel long distances to breeding grounds under a wide range of conditions, barnacles reproduce by extending impressively long penises to find and fertilize distant mates.

Compelled to mate, yet firmly attached to the rock, barnacles have evolved the longest penis of any animal for their size - up to eight times their body length - so they can find and fertilize distant neighbours.


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