Sharks are fascinating creatures, not only for children. Sharks have electro-sensors that can detect electrical fields, present in all living beings. The big specimens like the great white shark, the bull shark and the tiger shark may have up to five layers of jaws. Sharks can lose up to 30.000 teeth during a lifetime. You and your child will find a lot more "fun-tastic" facts along with superb pictures and graphics. Sharks dominate the oceans for over 420 million years. This makes them older than the dinosaurs. A shark's skeleton is made of cartilage. It isn't made of bone. The Blue Shark and the Mako are capable of crossing the entire ocean. Enter in the marine world of this ferocious predator Find out more Children "will love to learn" and understand this great prehistoric marine creature: its origin, anatomy, feeding, habits and behavior.