Sharks are the fiercest animals in the ocean. A thick skin, a mouth full of sharp teeth, agile and flexible movements, so many marine animals fear.

There are about 340 species of sharks living in the ocean, and the whale shark is the largest, with a length of nearly 20 meters; the smallest shark is about 15 centimeters long. Shark scales are peltate, pectoral and fins are larger, and the tail fin is developed. Sex ferocious, agile action, steel teeth and sharp teeth make other fish chills, it is also known as the king of the sea.

The shark has a sensitive inner ear, the body side line can feel the tiny vibration, hundreds of meters away from people swimming in the sound of hitting the water, it can feel. It is particularly weak current in the water is also very sensitive, many fish as long as from its neighborhood through, it is difficult to escape bad luck.

Sharks, despite their ferocious nature, mostly do not attack humans. They live at the bottom of the ocean and feed on fish, shrimp and other creatures in the water.

There are about 20 species of sharks that eat people, and they are particularly sensitive to the smell of blood. These sharks live in the middle and upper layers of the ocean and feed on marine animals and fish. The most ferocious is the great white shark, which is about 10 meters long. There are also hammerhead sharks that attack humans.