Rulers of the Deep

• There are about 350 different types of sharks, but researchers think there are other sharks that haven't been discovered yet!
• "Chondrichhye," is the class of fish, sharks belong to.
• Sharks have a sensory organ which is called the "ampullae of Lorenzini" which they use to feel the electrical field coming from its prey.
• The dwarf shark is as small as your hand, while the whale shark can be as large as a school bus!
• A shark is one of the best hunters in the world. Even their little pups go out looking for food.
• A shark's hunger can be satisfied with one good meal. The meal can last a long time because a shark uses little energy to swim. Some sharks hold food in their stomachs without it being digested. If they eat a big meal, it can last three or more months!
• Sharks do not sleep the same way as humans do. They might seem as if they are sleeping but they are really just resting!
• Sharks are strong, healthy creatures. No other living thing can take better care of itself than a shark can! Like humans, sharks are at the top of the food chain.
• Sharks never get cancer! Their cartilage is used in being studied with the hope of developing anti-cancer drugs.
• Sharks have been around for more than 300 million years! They were around before dinosaurs!
• Sharks' bodies are heavier than the sea, so if they stop moving they sink. If they want to stay afloat, they must keep moving!
• Just as humans rule the land, sharks rule the sea! Many people fear sharks, because they hear stories about sharks killing and eating humans. Actually, most sharks are not dangerous!
• More people are killed by bee stings than by shark attacks.
• More than 90% of people who are attacked by sharks survive the attack.
• Sharks attack more men than women. No one knows why this is the case.
• The bull shark is the only shark that can live in both fresh and salt water. A bull shark may have been responsible for a shark attack that happened in a creek in New Jersey back in 1916.
• The largest shark teeth found belonged to a Carcharodon Magaloden shark and are 6 inches long. This shark is extinct and lived more than 4.5 million years ago.
• In the past, dried shark skin (shagreen) was used as sandpaper. In countries like Japan and Germany, shark skin was used on sword handles to get a non-slip grip.
  Until 1950, sharks were hunted for Vitamin A. After that period, a synthesizing method was developed.
• The Whale shark is considered the biggest fish in the world.
• The Whale shark is about 90,000 pounds in weight.
• The Basking shark is the second largest, it is as long as 40 feet.
• Bull sharks are able to bear a wide range of salinity. They are found in freshwater rivers and lakes in South America and Africa.
• The Pygmy shark is about 11 inches in length.
• The Dwarf shark is as tiny as you hand, while some Whale sharks are as large as a bus.
• The Dogfish sharks are so named, because they attack their prey like a pack of wild dogs.
• The modern shark has more biting force because of its protrusile jaw, which provides it with more biting force.
• Great white sharks can grow about 10 inches every year, thus, they grow to mature lengths of 12 to 14 feet.