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.

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Is it true that octopus have a single brain with an additional sub-brain/grouping of neurons for each leg and do we understand how this affects their decision making ability? - Quora

All About the Octopus: The Smartest of All Invertebrates – Gage Beasley

If an octopus is so smart, should you eat it? - The Washington Post

Our Noble Cousin: The Octopus - WSJ

The most intelligent invertebrate - what can the octopus do? - SCUBA News

Scientists peered into an octopus' brain — and were astonished at what they saw