Octopuses belong to a group of animals known as Cephalopoda. Cephalopods include octopus, cuttlefish, squid and the nautilus.
Octopuses have eight arms, which are extended from the mantle.
On each arm they have a double row of suckers which gives these animals enormous holding power. Octopuses also have the ability to regenerate lost body parts and can voluntarily sacrifice one of their tentacles if the need arises. The octopus has a larger brain than other invertebrates and is supposed to be one of the most intelligent forms of invertebrate life. The brain has two distinct memory storage areas, with an ability to learn and remember information from previous behaviour. The octopus can thus be taught and conditioned.