Common Octopus (Lat. Octopus vulgaris). It is found worldwide in tropical and semitropical waters from near shore shallows to as deep as 200 m. Lives for 12 to 18 months. The Common Octopus reaches 60-100 cm in length. The arms are lined with suckers. The skin is smooth and has special pigment cells that make it possible for the octopus to blend in with the surroundings. Feeds mainly on crustaceans, fish and bivalves. It is normally solitary and territorial. It finds a home in a cavity or digs a burrow for itself and leaves it only to feed or reproduce. After mating, once the eggs are spawned, the female cares for them for about 6 weeks, eating truly little or not at all, in order not to leave traces of food residues that often attract the predators, with risks for itself as well as for the progeny. They are quite intelligent and have been observed using tools.