Octopus and squid belong to cephalopods. Squid, like octopus, has eight brachiopods and a pair of super-long brachiopods, which are responsible for hunting. Brachiopods are covered with suckers. These suckers are not only used to hold the prey tightly when hunting, but also provide the surrounding information!
In the sea, octopus has a rich menu, and crabs, shrimps and shellfish are all its delicacies. When eating, it first injects anesthetic into a hidden mouth to prevent the prey from struggling, and then injects digestive enzymes to digest the meat of the prey into liquid and drink it. After eating, octopus often leaves many empty shells of shrimps and crabs, and divers can use the empty shells to know whether there are octopus around.
However, it will take some time for divers to really find octopus. No, I know from the shell left in front that the octopus is nearby, but I can't find it. The diver wouldn't have found this octopus if his harpoon hadn't touched it occasionally! It escaped into a crack in the rock, its body color changed constantly, from rose, golden yellow to deep purple, and there were some strange patterns, just like a kaleidoscope. What the hell is going on here?
It turns out that there are many pigment cells under the epidermis of octopus, and each pigment cell is connected with several muscle cells to manipulate the expansion or contraction of pigment cells, thus changing many colors. This color-changing ability has a great effect on octopus! When the enemy comes, the octopus turns into a terrible color to scare the enemy and make him afraid to act rashly: shrimp and crab are fascinated by the beautiful pictures made by octopus, which have become a delicious snack for octopus.
In addition to feeling the information from the outside world with eyes, the sucker on its wrist and foot also has a photosensitive function! Therefore, even if the octopus is blind in both eyes, as long as there is a sucker, it can also play a color-changing trick.
Octopus is not only changeable in body color, but also a master of escape! It knows the truth of "losing the car to keep handsome": crayfish is its deadly enemy. Once we meet in a narrow way, we will fight to the death. But when it can't resist the enemy and a wrist is caught, it will break it and run away every day. The blood vessels at the wrist and foot will close by themselves to avoid excessive bleeding, and a new wrist and foot will grow at the broken part. Isn't that interesting?
What's more, the octopus's body can be deformed like rubber, and it can even be pressed into the shape of a pancake to escape from an incredible gap. With this unique skill, octopus made marine scientists play a lot of jokes: the caught octopus climbed out of the basket and got into the teapot; The octopus in the bucket ready to learn smiles at you on the bookshelf!