An octopus, plural: octopuses, octopi, or octopodes, is a cephalopod mollusc of the order Octopoda.

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An octopus, plural: octopuses, octopi, or octopodes; see below) is a cephalopod mollusc of the order Octopoda. It has two eyes and four pairs of arms and, like other cephalopods, it is bilaterally symmetric. An octopus has a hard beak, with its mouth at the center point of the arms. An octopus has no internal or external skeleton (although some species have a vestigial remnant of a shell inside their mantles[3][dead link]), allowing it to squeeze through tight places.[4] Octopuses are among the most intelligent and behaviorally flexible of all invertebrates.

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