![]() Crabs, crayfish, and bivalve molluscs (such as cockles) are preferred, although the octopus eats almost anything it can catch. More than 20,000 tonnes (22,000 short tons) are harvested annually. vulgaris is caught by bottom trawls on a huge scale off the northwestern coast of Africa. ![]() It lives for 1–2 years and may weigh up to 9 kg (20 pounds). Octopus vulgaris grows to 25 cm (10 inches) in mantle length with arms up to 1 m (3.3 feet) long. Training experiments have shown the common octopus can distinguish the brightness, size, shape, and horizontal or vertical orientation of objects. ![]() Using its beak, it is able to break into the shells of shelled molluscs. It is able to change colour to blend in with its surroundings, and is able to jump upon any unwary prey that strays across its path. Crabs, crayfish, and bivalve molluscs (two-shelled, such as cockles) are preferred, although the octopus eats almost anything it can catch. The species is also common in the Western Atlantic. It also occurs off the Azores, Canary Islands, and Cape Verde Islands. It is cosmopolitan, that is, a global species, which ranges from the eastern Atlantic, extends from the Mediterranean Sea and the southern coast of England, to the southern coast of South Africa. Octopus vulgaris is one of the most studied of all octopus species, and also one of the most intelligent. The common octopus ( Octopus vulgaris ) is a mollusc belonging to the class Cephalopoda.
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