Meet the world’s deadliest fisher, the Irukandji Jellyfish. This tiny jellyfish has extendable arms that are loaded with venom filled harpoons. To attract prey the Irukandji extends then quickly retracts sections of it’s long arms, like it is ‘jigging‘ for fish. When contact is made with the arms, a barrage of venom filled harpoons (nematocysts) are unleashed on the unsuspecting victim.