The king jellyfish is a large jellyfish that can be found in the Pacific Ocean. It has a wide range of predators, including fish and birds. The king jellyfish is considered to be the most dangerous jellyfish in the world. They are known for their sting which can cause death in many cases due to its potency. You slap it on the back of its head or use your hands to try and knock off its tentacles, but it will continue to sting you. The king jellyfish has a relatively small mouth and its tentacles are short, blunt and not very flexible.