Today there are 300 species of these fascinating animals, present throughout the planet. Most of them have three hearts: the main is connected to two small branchial hearts that pump oxygenated blood through the gills.
Octopuses have exceptionally good cognitive abilities. They can solve complex mathematical problems and have exceptional learning skills. It is often said that they have 9 brains. Their “diffuse brain” is an amazing organ: it is composed of 500 million neurons distributed in a central encephalon and eight arms. They are friendly animals and players, just like dogs or chimpanzees.
Some scientists argue that they could have become the dominant species on the planet instead of humans. But evolution has not allowed it: it has a life expectancy too low to be able to transmit his knowledge to his offspring and allow it to improve over the centuries; in addition, its reproductive system is very unfavorable since the male and the female die both a few months after mating. When she is born, each octopus must learn everything from the beginning.