Almost all sharks are meat eaters.  They live on a diet of fish and sea animals (like dolphins) and even such prey as turtles and seagulls.

Sharks have the most powerful jaws on the planet. They have sharp teeth. Sharks never run out of teeth.  If one is lost, another comes forward from the rows of backup teeth. A shark may grow and use over 20,000 teeth in its lifetime.

Normally, sharks eat alone.  But sometimes one feeding shark attracts others.  They swim up as quickly as possible and all begin to try to get a piece of the prey.  They bite wildly at anything that gets in their way -- even each other.

Do you think sharks are dangerous?  The most dangerous sharks are the Great White shark, the Tiger shark, the Hammerhead shark, the Mako shark and the Bull shark.  On average, there are only about 100 shark attacks each year and only 10 of those result in a human death.  

You should check it out from their perspective, though!  People kill thousands of sharks in a year for sport and for food.  Shark skins are used to make products like any other leather would be.  Up until the 1950's, shark livers were used as a vitamin A supplement.  Shark fin soup and shark steaks are both eaten in many countries. So... who's dangerous?