A Cephalopod – "head-and-foot animal” Popular name of any ten-armed cephalopod of the family Sepiidae, particularly the common cuttlefish, Sepia officinalis. The name cuttlefish is sometimes erroneously applied to the squid. About 100 species of cuttlefish are known, widely distributed in the seas of the Tropic and Temperate zones. They commonly range in size from 15 to 25 cm, but the larger species reach a length of 61 cm.
Cephalopods have the most advanced nervous systems of all invertebrates.
Cuttlefish are the most incredible looking creatures. A cuttlefish has ten arms (eight shorter and two longer tentacles) and a chalky internal shell. This part is what you often find washed up on the shore (budgie food).One pair of arms is longer than the rest and is used to capture prey.