- Fossil records indicate that the first shark lived 300 million years ago.
- Sharks are among the oldest living things.
- The approximately 200 to 250 species of sharks live in all oceans of the world.
- Nurse sharks spend most of the their time at the bottom of shallow.
- Sharks have skeletons composed of cartilage rather than bone.
- Sharks have five to seven gill slits.
- There are over 400 different species of sharks.
- Baby sharks are called "Pups".
- New research shows that sharks may be colorblind.
- Shark's wounds heal rapidly.
- Unlike most animals sharks can move both lower and upper jaw.
- You are most likely to drown than to be attacked by a shark.
- Some sharks can produce more than 30,000 teeth in their lifetime.
- Some shark species females can be pregnant for up to two years.
- Very few of the more than 350 species of a shark are known to attack humans.
- The whale shark may live up to 150 years.
- Sharks are highly tuned ears that help them hear their prey.
- Sharks have existed almost unchanged for 400 million years.
- Shark do not have a single bone in their bodies their skeletons are made of cartilage.
- Hammerhead sharks are born with soft heads so they wont jam their mother's birth canals.
- The first shark pup to hatch inside it's mother's womb devours it's unborn siblings.
- Despite the fact that an equal amount of men and women swim in the ocean, men account nearly 90 percent of shark victims.
- About two-thirds of shark attacks have occurred in less than 6 feet of water.
- Sharks inhabited the earth 200 million years before the dinosaurs appeared and have changed only minimally.
- Great White sharks are at the top of the food ocean's food chain.
- Great White sharks mostly eat tuna.
- Great white sharks are mostly found generally in cool waters.
- They can roll their eyes back into their head to protect them.
- Shark skin is very rough and can be used as sandpaper.
- Humans kill more than 100 million sharks each year.
- More people are killed each year by falling coconuts in Asia than people being killed by sharks.
- Sharks have been our oceans for over 400 million years.
- Shark's livers contain lots of oil. This makes the shark keep their balance in the water.
- Some sharks have what is called Nictitating membrane that closes to protect.
- Sharks can generate up to 40,000 pounds during their lifetime.
- Sharks are much older than dinosaurs by a lot.
- Although sharks have eyelids, they never blink.
- The average species of sharks lives around 20 years old.
- Sharks can detect am electrical pulse emitted by a standard AA battery from a mile away.
- There are 75 species of shark on the endangered list.
- A large meal may last a shark up to three months.
- The shortfin mako is the fastest shark reaching up to 75 MPH.
- The Dwarf Lantern shark is the smallest.
- Sharks attack men more than women.
- The Bull shark can live in freshwater and saltwater.
- By counting the rings on the shark's vertebrae you can tell how old the shark is.
- Most species of shark can be found in open water, allowing them plenty of space to swim and fish to eat. However, the goblin shark lives along outer continental shelves and underwater mountain ranges. Their dwellings are too deep for humans, so we don’t know much about them.
- Until recently, sharks were thought to be immune to cancer. However, recent research proves that sharks to develop cancer, a variety of illnesses and deformities.
- You may think of sharks as ravenous, man-eating terrors of the sea, but in reality, 97% of the more than 500 species of shark — are harmless to humans.
- Humans are the shark’s biggest predator, but killer whales, crocodiles and seals have been known to eat sharks as well. Large sharks will even go after smaller, younger sharks that might make easy prey.
- Galeophobia is the excessive fear of sharks. It comes from the Greek word “galeos,” which was a particular type of shark
- Be glad you’re not a shark, moms! The gestation period for a pregnant female shark can range anywhere from five months to two years.
- Unfortunately due to overfishing and shark finning, some population of certain shark species have been hunted down by approximately 90%.
- Between 30% and 80% of a shark’s flesh is made of water. A protein network gives the flesh its structure.
- Angel sharks, also known as sand devils, will dig themselves into piles of sand. They lie in wait, waiting for unsuspecting fish to pass by before rising up and attacking.
"Shark." Britannica School, Encyclopædia Britannica, 3 Feb. 2017. school.eb.com/levels/middle/article/shark/277020. Accessed 1 May. 2017.