The Lion's Mane Jellyfish is one of those creatures that don't seem real. They should exist in a science fiction novel, not in our oceans. The Lion's Mane looks like a regular jelly fish with a forest of tentacles extending from a mushroom-like head. They are the largest known species of jellyfish and live in the cold waters of the Arctic, northern Atlantic and norther Pacific oceans.
The largest recorded Lion's Mane Jellyfish washed up on the shores of Massachusetts in 1870. Its body had a diameter of 7 feet 6 inches, and it's tentacles measured 120 feet, which is longer than most Blue Whales. Imagine taking a walk on the beach and encountering this beast.
The Lion's Mane Jellyfish vary greatly in size, though with some only reaching about 20 inches in diameter. Their predators include sea birds, larger fish and sea turtles. The jellyfish themselves feed mostly on zooplankton and smaller fish.