PENIS FENCING IS A MATING BEHAVIOR ENGAGED IN BY MANY SPECIES OF FLATWORM, SUCH AS PSEUDOBICEROS HANCOCKANUS. SPECIES WHICH ENGAGE IN THE PRACTICE ARE HERMAPHRODITIC; EACH INDIVIDUAL HAS BOTH EGG-PRODUCING OVARIES AND SPERM-PRODUCING TESTES. THE FLATWORMS "FENCE" USING EXTENDABLE TWO-HEADED DAGGER-LIKE STYLETS
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