The Tiger Shark

If you love sharks and would like to know more about them, then you should read on.

• One of the facts about sharks is that they do not have bones. Their skeletons are made of cartilages.
• Their senses are also good. They can smell something from very far.
• There are sharks that give birth to their young ones but a majority of them laid eggs.
• A whale shark, which is the biggest shark, has a weight of 90,000 pounds.
• The dwarf lantern shark grows to 6 to 8 inches and is the smallest shark.
• They do not have scales but their skin has dermal dentils. In fact their skin was used to smooth wood.
• Sharks do not sleep completely like humans, they sleep while swimming. They have to keep water flowing through their gills, this is necessary so that they will have oxygen.
• It is not easy to determine the lifespan of sharks but estimation reveals that the whale shark can live up to 100 years.
• Uncommonly known to most people, sharks are not dangerous to people. Research shows that out of all the shark species only 10 are a threat to humans. Another fact is that, sharks are known to attack more men as compared to women.
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  The Great White Shark

  Most types of sharks usually have 40 to 45 teeth (per row). A sharks teeth fall off more often because they do not have roots. Each jaw has 5 rows of teeth and once a tooth falls off it is replaced by a new one within a day. These new teeth usually grow bigger than the previous one and this only means that they have bigger teeth when they grow old.

• They have a transparent membrane which covers their eyes.
• The shark liver oil can be used by human beings as a source of vitamin A.
• The only shark that can live in salty as well as fresh water is the bull shark.
• The spiny shark is known to be the longest living shark.