The octopus is the invertebrate with the largest brain, and probably the smartest of all. Octopuses also have an ingenious way to increase their neuronal capacity, distributing nerve cells in different processing units, such as several networked chips.
Only one third of the octopus cells are thus in your brain. The rest is scattered throughout the body, especially the arms. This means that the arms act on their own initiative, and even learn to do things without help from the central brain.
The escapist octopus
They have a strange anatomy: three hearts, a body that can deform on a whim, the mouth shifted to the side... And they are magicians of camouflage. And they have extraordinary intelligence, as we can see in the following examples:
The most famous case took place in April 2016, when an octopus named Inky, from the New Zealand National Aquarium, managed to escape. Apparently, someone had left the lid of his aquarium badly closed and the octopus slipped through the opening, descended from the side of the aquarium, He advanced along the ground and finally dropped down a drain that led directly to the sea.
There have also been other sounded cases, as the book explains Guinness World Records Science:
In February 2009, a female octopus from the Santa Monica Pier Aquarium in Los Angeles dismantled the water recycling pipes that fed its reservoir. Then he directed the jet of water outward, which caused the aquarium to flood. Another octopus, this time at the University of Otago (New Zealand), learned to short-circuit the building's electricity by throwing jets of water at the lamps at the top of the tank. It was so expensive to repair that the researchers eventually released the octopus into the sea.
And, when they spend a few days in the aquariums, octopuses become very curious and swim from one side of the tank to the other, analyzing every square centimeter. After a while, many try to escape.