Cuttlefish, facts and photos | National Geographic Cuttlefish control buoyancy using an internal shell called the cuttlebone By adding different amounts of liquid or gas into tiny holes within this structure, these animals can change their
Cuttlefish | Description, Anatomy, Facts | Britannica Cuttlefish, any of about 100 species of marine cephalopods belonging to the order Sepioidea and characterized by a thick internal calcified shell called the cuttlebone Cuttlefish range between 2 5 and 90 cm (1 to 35 inches) in length and have somewhat flattened bodies bordered by a pair of narrow fins