Octopus, also known as "cockroach" and "wangchao", is a mollusk with 8 wrists on its head, so it is commonly called "eight-banded fish". They mostly inhabit shallow gravel or soft mud bottoms and rocky reefs. Octopus has a well-developed brain and nervous system, and has a strong memory.
Therefore, it is often regarded as the most intelligent invertebrate. The octopus is small, its body surrounds the head and is connected to the head, 8 wrists are extended from the head, the wrists are connected by membranes, and each wrist has two rows of fleshy suction cups, which can be firmly adsorbed on the seabed and powerfully grasp prey.
Its brachiopods have keen tactile and taste receptors, which can help it distinguish food very well. The structure of the octopus body is chick. At its neck, there is a tube called a "funnel". When the octopus swims, a high-speed stream of water can be spewed out from the funnel, and the resulting reaction can push the octopus forward rapidly, which makes the octopus travel much faster than other marine animals and facilitates the capture of hunting objects.
When it encounters an enemy, it can also quickly escape. The octopus's mythological system provides effective control over color cells on the skin. When stimulated by the outside world, the octopus can use the "blindfold method" to quickly escape.
When the octopus is stimulated by the outside world, the color cells will be arranged to the epidermis, and suddenly different colors will appear. Sometimes the color changes slowly, sometimes it suddenly changes, and this color change can make it blend with the surrounding environment in order to deceive the opponent and protect itself in time.
Octopus can also rely on the ink glands and fluid sacs in the body to escape from predators. The ink glands and sacs are connected to the digestive system. The ink glands are able to create a black or brown liquid that flows into an empty sac, and when danger approaches, the octopus squirts the ink from the sac through the anus and uses a smoke screen to confuse the opponent.
The most powerful thing is that the octopus can actually break its foot on its own. Sometimes, it is difficult for an octopus to escape the pursuit of the enemy, and if the brachiopod is caught by the enemy, it will use the last trick, contracting the muscles in the brachiopod and severed the brachiopod with force. At this point, the enemy will pounce on the writhing brachiopods, and the octopus has long since fled. Octopus generally self-destructs at 4/5 of the brachiopods, and after self-cutting, the wound will close on its own without bleeding. After a few dozen days, new brachiopods are born.
Octopuses especially like to hide in empty utensils such as bottles, cans, containers, etc. Taking advantage of this special habit, people have successfully brought into play the role of octopus salvage and made them "master salvage masters." So how do you play this peculiar function of an octopus? How does this competent underwater "salvage worker" "work"?
At the beginning of the 19th century, the Japanese imperial family loaded a large amount of precious porcelain on a cargo ship, and on the way back to China, an accident occurred in the Japanese sea, and the cargo ship sank into the sea. More than a hundred years have passed, and the place where the shipwreck was wrecked was so deep that divers could not dive there.
Finally, someone came up with a clever trick: ask the octopus to help. People tie long ropes to octopuses and slowly place them on the shipwreck. The "salvage worker" suddenly found all kinds of beautiful vessels and immediately burrowed into them, at which point people slowly lifted the rope, and before they knew it, the octopus played its great role, and this "salvage master" successfully saved the precious porcelain in the shipwreck.