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An octopus has 9 brains — one central and one in each arm

An octopus has a central brain that coordinates overall behaviour, but each of its eight arms also contains its own cluster of neurons — essentially a local brain — that can operate semi-independently. About two-thirds of an octopus's neurons are in its arms, not its central brain. An arm that has been severed from the body can continue to respond to stimuli and attempt to bring food to where the mouth used to be for up to an hour. The arms effectively 'think' locally, reducing the processing load on the central brain.

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