The octopus is a complex aquatic animal, belonging to a class -of cephalopods. Its body plan has all the organs centralized within a large body cavity. These organisms have eight long limbs, which extend away from the body cavity; on average they may grow up to 14 feet long.
Octopuses are invertebrates noted for their intelligence; they are capable of adapting to evade predators. They can camouflage by altering their appearance to hide within their environment, produce ink to obscure their environment and allow for their escape. One species produces toxins when attacked -the Australian Blue-Ringed Octopus.