Box Jellyfish is the most venomous animal in the world. It has caused at least 5,567 recorded deaths since 1954. It’s toxins attack the heart, nervous system, and skin cells. And the worst part of it is that box jelly venom is so overpoweringly painful, that human victims go straight into shock, and drown or die of heart failure before even reaching shore. Survivors experience pain weeks after the contact with box jellies.