Modern people usually think that octopus is the smartest invertebrate, and it is also called primate cultured in the ocean. Among invertebrates, octopus has a particularly developed nervous system, which can be said to be a "heterogeneous" among invertebrates. It has 500 million nerve cells, which completely kills other invertebrates in number. Octopus has two memory systems, one is the brain memory system, and the other is the system connected with sucker on eight wrists and feet. The most amazing thing about octopus is that its eight brachiopods can work in multiple threads at the same time. They can independently perceive the environment and make quick responses. What's even more amazing is that some octopus species can significantly rewrite their DNA, thus diversifying their nervous system protein to adapt to environmental changes. For people and other creatures, this thing is completely incredible.

According to research, octopus has three hearts and nine brains, and the super neurons in the body have even reached the basic stage of human beings. There are 500 million neurons in the octopus brain, which is more than the species such as mice seen in daily life. So octopus may be smarter than humans, which is a very large number in terms of the number of neurons. Moreover, some people even say that octopus can predict the future. Whether this statement is true remains to be studied.

Humans and octopus belong to different branches in evolution, but both of them have evolved their own core characteristics: intelligence. Octopus can walk, open bottles, escape and so on, and octopus, like human beings, not only has high memory and learning ability, but also can adapt to human environment. Compared with other creatures, octopus has completely exceeded human imagination and possessed human "thinking", so people will say that octopus's IQ is too high for people to understand. Of course, the IQ of octopus is far from that of human beings.