The octopus (traditionally, plural: octopuses) is a cephalopod mollusc of the order Octopoda. Octopuses have two eyes and four pairs of arms.
An octopus has a hard beak, with its mouth at the centre point of the arms. Octopuses have no internal or external skeleton (although some species have a vestigial remnant of a shell inside their mantle), allowing them to squeeze through tight places.
They may look like suckers but Octopuses are among the most intelligent and behaviorally flexible of all invertebrates.
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