1, essential difference
Squid, whose real name is mullet, belongs to the order Cephalopoda, a mollusk. It is also called cuttlefish because it will escape by inkjet when encountering a strong enemy. Octopus, also known as stone house, octopus, etc., belongs to the order Octopoda among mollusks, and sometimes spews black ink to help escape.
2. The number of tentacles is different
Squid has 10 brachiopods without sucker. Octopus, on the other hand, has eight wrist feet, and there are many suckers on the wrist feet.
3. Differences between brain and predation
The squid's brain is not fully developed, and it acts by feeling, so it gives people a very stupid feeling. In addition, squid mainly eats fish and shrimp. When encountering enemy harm, it uses two magic weapons to deal with it: one is ink jet, which ejects the ink from the ink sac in the body; The second is discoloration. It is obviously a black squid, but it turns yellow for a while and red in a blink of an eye.
Octopus has a developed brain, which can distinguish itself in the mirror, and can also walk out of various mazes designed by scientists and eat crabs in the maze. In addition, octopus is not protected by hard shell, and its body is elastic, so it can squeeze into tiny caves and eat crabs and other animals as food: its mouth can bite through the crab shell and spit out toxins that can paralyze nerves.