Most sharks live for about 25 years, but some of them can live for 100 years.
Sharks take great care of themselves, and are strong and healthy creatures.
Not all species are required to be in continuous motion to breathe.
They are considered one of the best hunters in the world. Their little pups go out to look for food too.
Their skin is covered by small, razor-sharp structures called denticles. These can be removed from their body. Once removed, the remaining skin is made into strong leather.
Most kinds can swim up to 20 - 40 miles per hour. The shortfin mako shark is known to clock a speed of 60 miles per hour.
One good meal is enough to satisfy a shark's hunger. The meal can last for a long period, because it uses very little energy to swim.
Out of all the people it attacks, more than 90 percent survive.
In the past, dried shark skin known as shagreen, was used as sandpaper. In countries like Japan and Germany, the skin was used on sword handles to get a good grip.
Until 1950, sharks were hunted for Vitamin A. It only stopped after a synthesizing method for the same, was developed.
The pygmy shark is about 11 inches in length, while the dwarf shark is as tiny as you hand.
Great white sharks can grow about 10 inches every year, eventually reaching a length of 12 to 14 feet at full growth.