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SEXUAL DUELING

Combining both sexes in one body doesn’t eliminate conflict. Two hermaphroditic marine flatworms (Pseudoceros bifurcus) struggle for the male role in a duel (top) to be the first to inject sperm into the opponent’s body (middle). Sperm from Pseudobiceros bedfordi can dissolve through skin, but too big a splash corrodes the recipient into fragments (bottom). Credit: N. Michiels

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