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Belgian researchers find surprising similarity between octopus and human brains


Seuntjens also points out that octopuses have half a billion nerve cells, about the same as a small ape. Only a third of those cells are in the brain, the rest in the arms. Because the animals in their arms have so many nerve cells, it is sometimes claimed that they have nine brains: one in the head and another in each arm, each of which also behaves independently. But that statement has since been disproved by scientific research: an octopus has only one brain that controls the entire body.

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