They have no backbone, they are made up of mostly protein, so they require a high protein diet. They have tentacles that can shoot out roughly a foot and a half, and they are very accurate for catching live prey. They change colors regularly and often. Researchers have shown that cuttle fish use these color changes as a way to communicate.
Cannibalism is common among cuttle fish especially around mating season.
They live around the European coasts and off the coast of Japan. Cuttle fish only live for about a year. 2000 - 4 Archive Home Page.