A cuttlefish is a type of mollusk related to octopuses and squid. It has 8 arms and 2 tentacles, along with color-changing skin that allows it to camouflage and communicate. Studies have shown that cuttlefish are better subjects for maze learning experiments than octopuses, as they are more social and less likely to damage equipment. Cuttlefish have demonstrated an ability to learn and solve mazes using visual cues.