Also called the cuttles these molluscs fall under the order of Sepiida. They are known for having an internal shell which goes by the name the cuttlebone. Their distinctive feature is the presence of large W shaped pupils, two tentacles and eight arms. These tentacles have suckers using which they trap their prey and hold it tightly. Their Average size ranges from 15-20 centimetres though the longest variety seen went up to a length of 50 centimetres.

The diet of a cuttlefish includes other cuttlefish, shrimps, molluscs, crab and octopus. The average life expectancy of the cuttlefish is between one to two years and their predators are sharks, dolphins, seals, fishes etc. Similar to other molluscs these also have abundant stores of ink in their bodies. This ink is released when these fish are supposedly attacked.

The cuttlefish ink is used for multiple purposes like making the food sweet, flavour rice and pasta, and for dyeing plastics and other materials. Cuttlefish also have a camouflage facility which they use to change the colour of their skin. This trick is aptly used to hunt and scare their prey and attack them.