Day Octopus (Octopus cyanea). (order Octopoda). This marine invertebrate is a cephalopod mollusc. The octopus has a large brain and well-developed eyes. Eight tentacles form a ring around its mouth (a horny beak, not seen). It swims by jet propulsion with its body sac (upper left), or it crawls over rock surfaces. It lives in a cave or a crevice in rocks, emerging to hunt. Its prey is mostly crabs and lobsters, which it paralyses by injecting a poison. Some octopuses can reach a length of over one metre. Octopuses can vary their skin colour and may eject a cloud of ink when alarmed. Photographed in the Red Sea Israel
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