Otto the Octopus is an intelligent invertebrate who confounded humans

This story about Otto the Octopus from National Public Radio, illustrates the intelligence of octopuses. Otto is a resident at an aquarium in Germany.

Highly Intelligent: What Octopus and Human Brains Have in Common

Our Noble Cousin: The Octopus - WSJ

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Cephalopod intelligence - Wikipedia

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The Mind of an Octopus

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The mysterious inner life of the octopus