Box jellyfish are a curious breed. For one thing, they have two dozen eyes, most of which have lenses, corneas and irises. In other words, they can see, whereas the anatomy of a regular jellyfish only allows them to distinguish light from dark.
Box jellyfish also have a more advanced nervous system then their cousins, allowing them to quickly avoid — and engage — objects.
Also, unlike other species of jellyfish who wait for their meals, box jellyfish swim as they actively hunt their prey, which is mainly shrimp and small fish. They propel through the water at 4 miles per hour (6.4 kilometers per hour) by opening and shutting their bell-shaped heads, like an umbrella in a rainstorm.
