A popular predatory sea creature that often reminds us of childhood fears and fascinations with the sea, sharks have been in the world's oceans for over 400 million years.
Despite common human fear of sharks, it's actually the sharks that should fear humans, since human beings kill more than 100 million sharks every year. Though thousands of people come into contact with sharks in the shallow waters of beaches around the world, only 30-50 shark attacks are reported on average each year.
