Octopus has the highest intelligence level among mollusks and the second intelligence level among aquatic animals, second only to dolphins. His brain and nervous system have been evolving. His brain has two memory systems, which are bigger than human's, but the overall brain structure is not as complicated as human's, and many functions of neurons are much worse than human's.

Untrained octopus has learned to confuse prey and intimidate natural enemies by changing the color of epidermal cells in the long evolution. They will also pretend to be sea urchins and anemones, imitating their surroundings to deceive their opponents. They will "amputate" and escape in an emergency, or spray water, and occupy each other's shells to protect themselves after eating shellfish. Trained octopus can open the bottle cap, pull out the cork, jam the shell of shellfish with tools such as stones, do simple math problems, and have a strong memory.

But octopus lives in the sea, and the relatively comfortable living environment limits its intellectual development. It is a kind of mollusk with backward cannibalism instinct, and its development is inhibited by many natural enemies. Therefore, although it has experienced years of development, its intelligence level has not surpassed that of human beings.

Extended data:

Octopus can think all over.

It is found that the neurons in octopus head account for about 40% of all neurons, and 60% of neurons are distributed in each wrist foot, which is independent, unlike human limbs, which are basically dominated by the brain. In other words, even if the brain only gives abstract instructions, the octopus's wrist feet can react independently and complete the action.

For human beings, DNA transcription forms RNA, RNA translation forms protein, and protein is the foundation of human life activities. To put it bluntly, it is DNA that plays a decisive role. Humans can't change their genes at will, or their ability to edit protein is very limited.

But octopus is different. Octopus can modify its own RNA...DNA After DNA is transcribed to generate RNA, the protein of octopus translation changes directly, which means that octopus can adapt to the environment by changing its own cell function.

Shenzhen hotline-what are the cleverness of octopus in using shelling as the door of security inspection?