They are notoriously savage and bloody when they attack, but behind a sharks' vicious reputation is a variety of different shapes, sizes and demeanors. Learn all about the different types of sharks.
Sharks are able to breathe through their mouths underwater, while other fish breathe through gills.
Sharks have skeletons made of cartilage, while other fish have skeletons made of bone.
Sharks have smooth skin similar to humans, while other fish have large, scaly skin.
It varies depending on the depth where they're swimming; near the surface, sharks have an outstanding sense of smell, but in lower depths, they may have no ability to smell at all.
It's directional, meaning a shark can smell something to its left with its left nostril first.
It can only detect certain types of fish because of special sensory cells in its nostrils.
They generate nearly 1,000 times more force than most animals.
They are significantly more mobile than the jaws of most animals.
A shark's upper jaw dislocates when its mouth is fully opened, allowing it to capture and eat its prey more effectively.
relatively long -- most sharks live 25 to 30 years.
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