Just when you thought it was safe to go in the water… Box jellyfish deserve a movie all of their own, not only because they’re infamously the world’s most venomous creature, but also because they have a remarkable 24 eyes called ocelli, some of which peer up out of the water. But before you worry about being ogled at while you’re swimming, be reassured that the box jellyfish’s eyes are so primitive that they see only light and dark. The mystery is how they can interpret what they see when they have no brain...

More information:

boxjellyfish.org/box-jellyfish-eyes