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www.reference.com/article/sharks-16322f82683f010

Sharks are fish, but unlike other fish, their skeletons are made of cartilage rather than bone, and instead of smooth, flat scales they have sharp, tooth-like scales called denticles. Scientists believe that sharks are 200 million years older than the oldest dinosaur, meaning they have been around f

www.reference.com/article/amazing-sharks-9eb95f7f421f6f5a

An amazing fact about sharks is that the skins of females are much thicker than that of males. This is because male sharks tend to bite the females during mating. In its lifetime, a shark can go through about 30,000 teeth.

www.reference.com/article/fun-sharks-74df813027a2ee32

Some fun shark facts include that they have no bones, they have skin like sandpaper, have extraordinary sensory skills and teeth that are constantly being replaced. Most sharks never stop swimming and some species give birth to live young, called pups.

www.reference.com/pets-animals/many-sharks-world-8638e82d84a416d1

There are approximately 470 known species of shark in the world, but it's impossible to count the exact number of individual sharks on the planet. World Wildlife Fund estimates that more than 100 million sharks are killed each year for their fins.

www.reference.com/article/sharks-move-ebb093b7a38ad8f0

Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.

www.reference.com/article/sharks-fish-9831568962c46794

Sharks are fish, but they belong to the group called Chondrichthyes, or cartilaginous fish, which is a different scientific group than most types of fish. Common fish, such as tuna or salmon, all belong to the group Osteichthyes. The distinction is based upon the makeup of their skeletons.

www.reference.com/article/online-games-sharks-1ce8e20761cabfbc

Some online games about sharks include "New York Shark" and "Shark Lifting 2." Both of these games have high rating scores from users on Y8.com.

www.reference.com/article/animals-eat-sharks-43fbf4ddc077c189

Sharks are at the top of their respective food chain and are not usually hunted by other animals; however, sharks have been known to eat other sharks from time to time. There have also been a few sightings of moray eels eating small sharks.

www.reference.com/article/interesting-blue-sharks-a6285caea4c2aea

Blue sharks are known for their distinct coloring, which allows them to blend in with ocean water. From above, the water appears darker and camouflages the shark's dark blue back, while its white underside resembles the sunlit ocean surface when seen from below. As a pelagic species, blue sharks inh

www.reference.com/article/fun-whale-sharks-502cb5aaeeea69d7

Whale sharks are the largest fish in the sea and are found in tropical waters that are both deep and shallow. Even though they are huge animals, their diet consists mostly of tiny organisms called plankton. They also eat krill, jellyfish, squid and smaller fish.