An octopus 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, allowing it to squeeze through tight places. Octopuses are among the most intelligent and behaviorally flexible of all invertebrates.
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