The peculiarity of the octopus's senses is that it can change color according to the environment, and it can mimic forms.

The skin of the octopus is filled with pigment sacs. When the pigment sacs expand or contract, the octopus can change color. By quickly changing color to blend in with its surroundings, its ability to become instantly invisible is enough to help it effectively hide from the eyes of predators.

Some octopuses can not only change the color of their skin, but can even imitate various animals by changing their body shape. Mimic octopuses live in bare mud and sand on the seabed, with no coral or aquatic plants to hide around. If they sense a sign of danger, they will swim like a flounder. The mimic octopus arranges all its tentacles to form a flat surface behind its back to imitate the appearance of a flatfish, because flatfish with venomous stingers keep many predators at arm's length.

Octopus thinking:

Jim Cosgrove, an expert who has been engaged in octopus research for many years, pointed out that octopuses have "conceptual thinking" and can solve complex problems on their own. The ability gives it the ability to walk on two legs. Jim Cosgrove wrote in the French magazine "Le Figaro" that octopuses are one of the most different creatures from humans that have ever appeared on earth.

The octopus has well-developed eyes, which is its only similarity with humans. It is very different from humans in other ways: the octopus has three hearts, two memory systems (one is the brain memory system, and the other memory system is directly connected to the suction cup). There are 500 million neurons in the octopus brain, and some more on its body. Very sensitive chemical and tactile receptors. This unique neural structure gives it a thinking ability that exceeds that of ordinary animals.

Reference for the above content? People's Daily Online - Defense experts count octopuses

Reference for the above content? Baidu Encyclopedia - Octopus