Sharks Abby McGee

Basic Facts about Sharks

There are over 500 species of sharks. Humans kill over 100 million sharks per year. About seventy-five species are endangered. Around fifty different species can glow in the dark. Some sharks can make their own light using bio luminescence. Sharks can identify lower sounds than humans can detect. Some sharks "walk" instead of swim, using their fins as legs. Records indicate that sharks have been around for about 300 million years. While most live in tropic regions, some live in cold waters. Only a few species have been known to attack humans. They can live 20-30 years in the wild on average. Sharks can hear from 700 feet away.

Sharks in Pop Culture

Shark fin soup is eaten in many countries as a status symbol. The film "Jaws" was based on a real shark attack. Ancient islanders in the Pacific islands used to believe that the shark was a god that guided fishers and sailors. A lot of Hawaiian legends are told of sharks being gods that protected people. Playing dead helps survive a shark attack, as proved on "Myth Busters".

Hammerhead Sharks

While most sharks travel solo, the Hammerhead shark travels in schools during the summer. They have nearly a 360 degree sight line. They have a huge blind spot directly in front of them.

Great White Sharks

Great Whites can go months without food. Great Whites jump to catch seals, hitting them with the same force as a car crash. They can detect a drop of blood in twenty-five gallons of water. People eat around a half ton of food each year, while Great Whites eat around eleven tons. It has been estimated that Great Whites have a bite force of 4,000 PSI while a tiger's bite force is around 1,000 PSI.

Anatomy of Sharks

Sharks have skeletons made up of cartilage rather than bone. They can be a variety of different sizes, colors, and even patterns. Their skin is embedded with enamel covered dermal denticles. Between 30% and 80% of sharks skin is made of water. Female sharks' skin is thicker than males. Sharks jaws aren't attached to their skulls. They may have up to 3,000 teeth at a time and lose an estimated number of 30,000 teeth in their lifetime. Most sharks have eight fins. They can detect electricity using electroreceptor organs called Ampullae of Lorenzini. In most shark species, females are larger than males. One species of shark, the Thresher shark, has a caudal fin that can grow up to half the length of the shark itself. Unlike other fish, they don't have flaps over their gills. Sharks may have 5-7 gills, while other fish only have one. They can grow a whole new set of teeth in eight days. Since their teeth are made of fluoride, sharks can technically never get cavities.

Odds of a Shark Attack

More people are killed by falling coconuts in Asia alone than by sharks across the world. You have a higher chance of being killed by wasps, bees, hornets, or dogs than sharks. More people are killed annually by fireworks or lightning than sharks. People are 132 times more likely to drown at the beach. More people are killed in college or high school football. Roughly ninety-five more people die from hot tap water.

Tiger Sharks

Researchers have found tires, gas tanks, and even license plates in Tiger sharks' stomachs. It is the fourth largest shark. They're found in tropical and subtropical waters. They often appear near the coast. If their prey begins to flee, instead of chasing after it, they recoil and let it go since they don't engage in high-speed chases. Tiger sharks can survive several weeks without food. Attacks by these sharks are rare.

Bull Sharks

Bull sharks will attack anything that enters their territory. They range from 200-290 pounds. They eat everything from bony fish and other sharks, to turtles, birds, and even dolphins.

Works Cited

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"Carcharhinus Leucas." Carcharhinus Leucas :: Florida Museum of Natural History. Web. 27 Apr. 2017.

Reiner, Luke. "26 Facts about Sharks ←FACTSlides→." Shark Facts: 26 Facts about Sharks ←FACTSlides→. FACTSlides.com, 28 Nov. 2016. Web. 21 Apr. 2017.

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"Sharks in Culture." Shark Facts and Information. Web. 27 Apr. 2017.

"Tiger Shark." Shark Facts and Information. Web. 27 Apr. 2017.

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Abigail McGee
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