The cuttlefish is a small-medium sized mollusc that is found throughout the ocean waters of the world. It has a large, elongated body with tentacles surrounding their mouths. Cuttlefish are well known for the "flashing" colours that are displayed on their bodies during fighting and mating. In the same way as squid and octopuses, the cuttlefish also has an ink sack which ejects ink in order to fool oncoming predators.