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Sex Lives of Barnacles is Record-Breaking

Barnacles have the largest relative penises in the animal kingdom, and a surprising sperm capture system. ->

January 16, 2013
12:08 AM EST
On the left: A stalked barnacle with a relaxed penis (marked with arrow); On the right: Erect barnacles releasing sperm into water. Image: Marjan Barazandeh et al, Proceedings of the Royal Society B