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Horses and barn owls can see in three dimensions (3D), which helps them perceive distance and depth. Octopuses and squid are thought to lack 3D vision. many researchers once thought the same about cuttlefish, but Trevor Wardill and his team wanted to test whether this assumption was true. The team studied how cuttlefish wearing 3D glasses reacted to 3D images of shrimp (a favorite prey) projected on a tank wall. Cuttlefish changed their striking position to match the 3D images, suggesting that their vision is more like that of horses and barn owls than that of octopuses or squid.