Learn all about the amazing octopus, a marine cephalopod and invertebrate.  Detailed graphics, diagrams and video images tell us octopi lab mystery stories and help us learn about their intelligence and use of tools, camouflage techniques, amazing physical characteristics, biology and physiology, use of their limbs and suckers, defense mechanisms, locomotion, blood, brain neurons' locations, sight, life cycle, varied species, and how we are helping the octopus survive. Multiple-choice reviews at the end of each segment reinforce important concepts.