Octopus

Octopuses are soft-bodied, eight-limbed molluscs of the order Octopoda within the class Cephalopoda (alongside squids, cuttlefish, and nautiloids). The order includes about 300 species. They are bilaterally symmetric with two eyes and a beaked mouth at the center of their eight limbs. Octopuses can radically deform their shape to squeeze through small gaps and trail their appendages behind them when swimming backwards. They use a siphon for respiration and for locomotion via water jet propulsion. Octopuses have a complex nervous system, excellent sight, and are among the most intelligent and behaviourally diverse invertebrates. They inhabit a range of ocean habitats from coral reefs and pelagic waters to the seabed, including intertidal zones and abyssal depths. Most species grow quickly, mature early, and are short-lived. Reproduction typically involves the male delivering sperm with a specially adapted arm into the female's mantle cavity; the male then becomes senescent and dies. The female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Octopuses are predators that hunt crustaceans, bivalves, gastropods, and fish. Defensive strategies include expelling ink, camouflage, threat displays, rapid jetting to escape, hiding, and deceit. All octopuses are venomous; only blue-ringed octopuses are known to be deadly to humans. Octopuses appear in mythology and literature and are eaten as a delicacy in many parts of the world, notably the Mediterranean and Asia.

Octopuses use jet propulsion via a siphon and often swim backwards while trailing their limbs; they can also rapidly change shape to move through tight spaces.

Predators that hunt crustaceans, bivalves, gastropods, and fish.

The strongest linked planning options currently surface around destinations such as Coron, Malta, Mahé and countries such as Philippines, Portugal, Indonesia for divers building trips around octopuses.