Octopus wiki:
>For other uses, see Octopus (disambiguation). 14 in two suborders, see text. The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. The term may also refer to only those creatures in the genus Octopus. In the larger sense, there are 289 different octopus species, which is over one-third the total number of cephalopod species.
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tentacle wiki:
[acles can refer to the elongated flexible organs that are present in many invertebrates, and sometimes to the hairs of the leaves of some insectivorous plants. Usually, they are used for feeding and grasping. Anatomically, they work like other muscular hydrostats.
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