There are 368 types of sharks known to man, they are sorted into 30 different families. Some sharks can live in oceans, rivers and lakes. Sharks don't have bones, they have cartilage, that's what your ear is made of. Some sharks can be the size of your hand or bigger than a bus. The whale shark is the largest shark in the world the second largest is the basking shark.
Some sharks have flat bodies so they can hide in the ocean floor.
The whale shark, the basking shark and the mega mouth swim real fast. They open their mouths and eat all the fish and plants that come their way.