Unexpected facts about sharks

Sharks are likened to vampire and vampire assassins of the Ocean world. They can kill the enemy in a split second before the prey even knows what is going on.

But besides that scary death, there are many things about sharks that you may not know about:

1. A whale shark can weigh as much as 18,000 piranha tiger fish .

2. The ancestors of sharks appeared 400 million years ago, which is 200 million years earlier than dinosaurs . That means when dinosaurs dominate the ground, roar and become extinct because of climate change, cavalier sharks exist under their underworld.

3. Sharks can swim at speeds up to 60km / hour. Meanwhile, the average swimming speed of people is only 4km / hour.

4. Sharks without bones . Its 'bone' set comes from cartilage. Because there are no ribs, if they leave the water environment, the body's own weight can crush the internal organs before they suffocate.

6. Sharks are assassins of all assassins, meaning that no natural enemies are stronger than them and destroy them, except humans with advanced weapons. Fortunately, sharks only abstain from each killer whale.

7. On average, about 60 cases of shark attacks are recorded each year. Very few of them are deadly. In contrast, up to 70 million sharks are captured and killed each year by shark hunters.

8. Shark skin is 4 times more elastic and durable than cowhide. Sharks can sense changes in their habitats due to the boundary organs (neuromast) located just under the skin, distributed along the body and especially in the head. The function of the border agency is to help the shark feel the pressure and movement of the water flow.

9. Sharks can sense electromagnetic fields . Some lateral agencies are specialized to sense the electromagnetic. They recognize the difference in the potential between the shark's body and the environment. Scientists think this could allow sharks to detect prey as well as enemies, and mates. The ability to sense electricity can also help sharks to recognize the Earth's magnetic field, helping them determine the direction when migrating.

10. There are times when a shark can own up to 3,000 teeth . Their teeth are attached to gums rather than jaws and are constantly being replaced throughout their lives.

11. People have discovered many strange objects inside the stomach of a shark like an armor, a bottle of wine . That shows that sometimes the shark will swallow things that it grabs, instead of because crushing everything with your killer teeth.

12. Most sharks have 8 fins . Sharks can only swim off to avoid objects in front of them, because shark fins do not allow them to move backwards.

13 . Sharks can be hypnotized . Sharks may fall into a natural paralysis. Researchers can cause this condition if they flip the shark's abdomen or rub the muzzle area, depending on the species.

14. Sharks have an incredible sense of hearing and taste . They can smell the blood in the water from 1.5 km away. The shark's nose can detect the time delay of odors to a nostril compared to the other. They use that as a way to recognize the direction of the prey and turn towards the first smell.

15 . Many sharks are colorblind . The eyes of animals have two different types of cells that respond to light, rod cells and cones. Rod cells determine the brightness level while cones control color. A study of 17 different shark species shows that although they can see many different levels of luster, only one color is green.

16 . More than 400 shark species have been discovered so far.

17 . Sharks are gills, meaning they need constant flow of water to carry oxygen. Continuous swimming is a way to have regular water flow through the gills. But all animals need rest. Some sharks have special organs called breathing holes behind the eye that pump water through the gills, even when they are still.