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Sharks come in many varieties. They have survived on Earth for more than 500 million years! Over time, scientists have discovered more and more sharks. Scuba divers have even encountered many different sharks too! But there are more to learn.

Sniff, sniff. A shark smells blood from a dead fish, 600 yards away. Then, it turns around an to the direction of the prey. What kind of shark did that? Well, it could be any kind of shark. Sharks have the amazing ability to do that underwater. How do they do that? Sensors on the sharks' bodies help them. Those sensors are on the shark's skin, and they seem invisible. The gills on them help them breathe underwater. For bull sharks, however, can survive in fresh water. Sharks have so many amazing abilities compared to us.

(Alicia February 4, 2010)

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