Whale shark is the largest Shark-Sharks have 15 rows of teeth in their jaws
Sharks existed nearly 42 crore years ago. These existed even before the period of dinosaurs. Sharks are the big fishes that live in seas and oceans. There are nearly 400 species of sharks. Great white shark, Tiger shark, whale shark, Bull shark, Blue shark, Lemon shark are the important ones.
- In olden days the teeth of sharks were used as tips for arrows by people living in Florida.
- Few sharks grow more than forty feet in length.
- Whale shark is the largest of all sharks. It grows up to 50 feet and weighs forty thousand pounds. Lantern shark is the smallest of all sharks. This is only seven feet long.
- Sharks are carnivorous.
- There are no bones present in the body of sharks. Their skeletons are made up of cartilage.
- Sharks have five to 15 rows of teeth and their teeth fall after a week and new teeth replace the old one within one day.
- Most species of sharks give birth to live young but very few lay eggs.
- There is an estimation that sharks live up to 100 – 150 feet and small varieties live up to 20 – 30 years.
- Sharks have very good smelling sense. Sharks can also hear sounds from thousands of feet.
- Sharks can give up to 20 – 40 miles per hour.
- Sharks are the best hunters.
- Sharks do not sleep like human beings but only take rest.
- Bull shark is the only species that can live both in fresh and salt water.
- Sharks are found in all the oceans on earth.
- Liver is the largest organ in the body of sharks.
- Sharks have to swim constantly to keep them floated in water.
- Hundred million sharks killed every year for making necklaces with teeth, fertilizers with cartilage, leather with skin and cosmetics with liver.
- Whale sharks give birth to several hundred pups at a time.
- Sharks have ears inside of their heads and not on the sides of their bodies.
- Sharks hunt only when they are hungry.