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porcupine

Male argonaut octopuses have a detachable phallus, which is a small sperm ball inside a hectocotylus (modified octopus arm). When a female argonaut octopus swims by, the male's phallus detaches from his body, floats to the female and mates with her. The female can store multiple phalluses in her spacious mantle cavity (the cavity in which the gills are found). Shortly after releasing its phallus, the male dies.