Squid, Octopi & Cuttlefish all have shells. The shell may either be internal or very, very reduced, indicating an evolution from the dependence of a protective shell like the chambered nautiluses that has existed for millions of years.
Have you already heard about these little crochet octopus for preemies? I have tried to gather here all useful links and information on that amazing project around the world.
Como hacer bufanda Magica, tubular, multiusos en telar circular - YouTube