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Moving Octopus vulgaris. Octopus is a genus of cephalopod mollusc in the order Octopoda. The genus is quite typical of most octopods. They have two eyes and four pairs of arms with suckers. They have a hard beak, with the mouth at the center point of the arms. Octopods have no internal or external skeleton, allowing them to squeeze through tight places. Many stay in cracks between rocks or corals when they are not hunting. They are intelligent predators with a taste for crabs. Octopods inhabit many regions of the ocean,
An octopus trails its eight arms behind it as it swims. All octopuses are venomous, but only one group, the blue-ringed octopus, is known to be deadly to humans. Around 300 species are recognized, which is over one-third of the total number of known cephalopod species.The term 'octopus' may also be used to refer specifically to the genus Octopus.ll octopuses are venomous, but only one group, the blue-ringed octopus, is known to be deadly to humans. Around 300 species are recognized, which is over one-third of the total number of known cephalopod species.