In addition to a central brain located between the eyes, octopuses have separate “mini-brains” at the base of each of their eight tentacles. Unlike most creatures, octopuses have nine brains and use them incredibly skillfully. The giant Pacific octopus has three hearts, nine brains and blue blood, which makes reality stranger than fiction. According to Biogeo Planet, the octopus is considered the most intelligent creature because it has 9 brains.
But how does an octopus use 9 brains? In fact, each of his eight brains helps control arm movements. And, the center for other activities. Thanks to their nine brains, it seems that octopuses have the benefit of both localized and centralized control over their actions. Octopus and vertebrate brains have no common anatomy, but they support a variety of similar characteristics, including forms of short- and long-term memory, versions of sleep, and the ability to recognize individual people and explore objects through play.
Small individuals of the common manta octopus (Tremoctopus violaceus) carry tentacles of the Portuguese man of war as a weapon. This allowed the octopus algae (Abdopus aculeatus) to keep its other arms extended and maintain its algae appearance even as it moved. Human men would like to look more like octopus because giant Pacific octopus can consume between 2 and 4% and gain between 1 and 2% of their body weight each day. This is the part of the nervous system that determines what the octopus wants or needs, for example, if it needs to look for food.
An octopus has about 500 million neurons in its body, two-thirds of which are distributed among its limbs. When an octopus is startled, it will release ink in a direction that will simultaneously propel it in the opposite direction. The octopus is one of the few creatures that can regrow a completely cut or damaged appendix so that it is as GOOD as it is new and indistinguishable from the original. The blood of the giant Pacific octopus has a copper-rich protein called hemocyanin that improves its ability to transport oxygen in cold ocean environments.
In the first example of bipedal locomotion under the sea, two tropical octopuses were found to raise six of their arms and walk backwards on the other two. One of the most incredible demonstrations of octopus camouflage I've ever seen was filmed by Professor Roger Hanlon, from the University of Chicago. Because octopuses don't have bones, they can fit in extremely small spaces, such as in this “plexiglass wonderland” created by Nat Geo.