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This article is about the order of cephalopod. The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight arms behind them as they swim. Most species grow fast, mature early and are short-lived. The female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Giant Pacific octopus at Echizen Matsushima Aquarium, Japan. It is considered to be the largest species.

The head includes the mouth and brain. The skin consists of a thin outer epidermis with mucous cells and sensory cells, and a connective tissue dermis consisting largely of collagen fibres and various cells allowing colour change. Most of the body is made of soft tissue allowing it to lengthen, contract, and contort itself. They can extend and contract, twist to left or right, bend at any place in any direction or be held rigid. The interior surfaces of the arms are covered with circular, adhesive suckers. The suckers allow the octopus to anchor itself or to manipulate objects.

When a sucker attaches to a surface, the orifice between the two structures is sealed. The infundibulum provides adhesion while the acetabulum remains free, and muscle contractions allow for attachment and detachment. Cirrina with its atypical octopus body plan. The eyes of the octopus are large and are at the top of the head. The pupil can be adjusted in size and a retinal pigment screens incident light in bright conditions.