11. The Box Jellyfish
Domain: The Indo-Pacific Ocean
The box Jellyfish, aka “sea wasp”, is one of three varieties of dangerous jellyfish. Their stings are very painful and fatal. In fact, even less venomous varieties are generally fatal to children. Each of their long, dangling tentacles has roughly 500,000 microscopic mechanisms that can inject poison into a victim. A diver can die from heart failure before reaching the shore.
