These crustaceans have among the most complex eyes in the animal kingdom. Their eyes work both independently and together so they can scan the horizon as well as focus in on prey. Each eye has three focal points, allowing the animal to perceive depth with either eye.

Human eyes have three photoreceptors—cells that detect color—to distinguish between blue, green, and red light. With a staggering 12 photoreceptors, mantis shrimp can see 12 different wavelengths of light. Strangely, however, they are worse at detecting subtle color differences than humans so it’s not clear what purpose these photoreceptors serve.