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Octopuses Have a Secret Sense to Keep Their 8 Arms Out of Trouble – The New York Times

Even when an octopus can’t see light with its eyes, its arms seem to know it is there.

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We speculate this reflex is for protecting the arms and keeping them folded so that no crabs or fish will bite it when they think its kind of a worm, Dr. Shomrat said.
However, it is still a mystery how an octopuss arms can detect light, let alone respond to it. There is evidence that there are light-sensitive receptors in the skin, but no direct proof yet that they are responsible for the behavior, Mr. Katz said.
Surgical experiments, conducted under anesthesia and with care to minimize suffering,…

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