Flatworms are interesting, especially this species. Not only because they’re pretty much flat, but the Pseudobiceros Hancockanus has a very interesting mating process. That’s not the only thing that is interesting about them though. They move very efficiently and rather long distances through oscillations in the sides of their body.
How do these flatworms reproduce? They have a mating ritual called penis fencing in which the two worms essentially fight with their penises, lasting up to an hour. When one finally wins, the winner becomes the father and the loser becomes the mother. They actually reproduce sexually, by injecting sperm either into the other worm or by releasing it onto the skin of the other worm, resulting in the possibility of it entering through open pores in the receiving worms body.
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