A male blue-lined octopus mounts a female during mating and injects venom into her bodyWEN-SUNG CHUNGDuring mating, some male octopuses inject females with their potent venom to paralyse them and avoid being eaten by their mates.Typically, animals use venom to kill prey or defend themselves from predators. Some species of pufferfish, for example, produce one of natures most potent venoms, tetrodotoxin, as a defence mechanism. Several blue-ringed octopus species use tetrodotoxin as a powerful weapon to quickly immobilise and kill their prey.Now, in a