Australian Box Jellyfish
Next time you’re swimming in tropical waters, keep an eye out for the beautiful but deadly Australian box jellyfish. They have 60 tentacles, each of which are about 15 feet long and contain 5,000 stingers full of toxins capable of taking out as many as 60 people. Imagine a whole school of these creatures swarming near unsuspecting beachgoers. At least you have a fighting chance with a shark. Box Jellyfish are so transparent that they are difficult to spot. Once they sting you, you’ll go into shock before heart failure kicks in.