For over 400 million years, sharks have ruled the ocean. Older than trees, older than dinosaurs � they are nature's ultimate survivors.
Dive InThere are over 500 known species of sharks, from the tiny dwarf lanternshark to the massive whale shark.
Sharks can grow and lose up to 30,000 teeth in a lifetime. New teeth constantly replace old ones in conveyor-belt fashion.
Sharks detect electrical fields generated by other animals using special pores called ampullae of Lorenzini. They can sense a heartbeat from meters away.
Sharks have been around for over 400 million years � predating dinosaurs by roughly 200 million years and even older than trees.