This story about Otto the Octopus from National Public Radio, illustrates the intelligence of octopuses. Otto is a resident at an aquarium in Germany.
What is the most stunning display of intelligence by an animal (non-humans)? - Quora
Intelligent Invertebrates โ PennNeuroKnow
How Intelligent is an Octopus or a Cuttlefish? Even Smarter Than You Might Think! ยท Frontiers for Young Minds
Octopus: The Ocean's Intelligent Invertebrate by Jennifer A. Mather
Otto the Octopus is an intelligent invertebrate who confounded humans
Back to Nature - Free Otto.
Nevada professor receives grant to read the mind of an octopus
Highly Intelligent: What Octopus and Human Brains Have in Common
Beneath the Waves, Beyond Ourselves: What the Octopus Reveals About Human Potential - David N Johnson
How the Freaky Octopus Can Help Us Understand the Human Brain
Can an octopus get to know you?
11 Octopuses Caught in the Act of Being Awesome