Discover the secret of octopus - the sea monster

About 300 octopus species have been discovered by scientists in the vast ocean world. And this invertebrate also contains many interesting things that keep scientists from being surprised.

1. Octopoda octopus, has a soft body resembling that of squid. The octopus's structure is a boneless type, without a hard outer shell, so this animal can easily crept through small rock slots under the ocean. The only hardware of the octopus shaped like a parrot, lying under the head, between 8 arms.

2. Octopus with appearance looks like a dome or bowl facing up on a pile of large-sized beards. But in fact, what we still call the octopus's head is its body, which contains all the important internal organs including 3 hearts , 2 heart pumps And 1 heart will pump blood to the whole body.

3. The blood of octopus is light green .

4. The eyesight of octopus is very good but unfortunately they are deaf.

5. Of all marine species, octopus is classified as the smartest animal . Their nervous system works quite complex, more than two-thirds of the neurons are in the nerves at the tendrils. Octopus tassels have complex reflexes with the control of at least three levels of the nervous system.

6. The tentacles on the octopus's tassels have the same effect as the sucker to help the octopus hold onto its prey while these tentacles also help the octopus determine the terrain and shape of things it clings to. .

7. Octopus hands can grow back when lost.

8. Octopuses often prefer to flee rather than go back to fight with the enemy, they often charge water into the body and shoot at an extremely fast speed to create a reaction to push their whole body forward to Find your way to escape from the enemy. Their speed is about 25km / h.

9. Scientists have discovered that octopus has the ability to remember in the short and long term . They can distinguish shapes, mimic every activity of the object after observation. Octopus's ability to escape must be called a master because they are extremely intelligent. Some fishermen were unable to detect the octopus crept into their ship to eat well and disappear at any time.

10. However, octopus life cycle is very short , usually about 2 years, but there are only 6 months for species. Only the giant octopus in the Pacific can last up to 5 years if living in an ideal environment.

11. Scientists believe that octopus life is similar to salmon . They cannot survive long after mating. Males usually die after a few months after putting their spermatozoa into females. Female octopus will live longer to protect their eggs.

An interesting thing is that octopus has a quite special mating mechanism. The male will create a sperm cell and put it into the female body through a hose. When entering deep into the female, this tap will begin to bulge, easily discharging its crystal easily and thoroughly, able to eliminate the opponent's future children first.

12. Like chameleon, octopus has the ability to transform the body color to adapt to the surrounding environment so that it can avoid enemies perfectly. In addition, octopus can spray ink on opponents when in danger. Dark ink makes these attackers unable to see the octopus and they easily escape.

13. Bach belongs to the night hunter, their favorite food is crab, mollusc and crayfish.

14. Female octopus can lay up to 150,000 eggs in two weeks. Children will not find prey but only focus on protecting their eggs. That makes the baby octopus after birth lose their mother because their mother died of lack of nutrients and hunger for a long time.

15. A newborn baby octopus is the size of a flea .

16. Blue-spotted octopus is one of the most venomous marine animals in the world: it can kill you after a bite.

17. Octopus moves by crawling or swimming. But their main way of moving is cows.