Shark Facts

- Sharks become immobile when upside down.

- 70% of the world's oceans are shark-free.

- 80% of the shark species do not grow over 2 meters.

- About 25 species of sharks are known to attack people.

- Sharks never run out of teeth. If one is lost, another spins forward from the rows and rows of backup teeth.

- Megalodon was an ancient shark that may have been 40 feet (12 m) long or even more.

- The whale shark has the biggest mouth among sharks.

- The fastest swimming sharks are the mako sharks and blue sharks.