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The Secret Life of Great White Sharks

Uploaded by Admin on Mar 09, 2001

Great White Sharks are greatly misinterpreted as vicious man-eaters because of the media, movies, and people’s imaginations, but they are actually large fish who mistake people for seals and other marine life. What is a great white shark? The great white, among the least understood of Earth’s creatures, is an apex predator, meaning that it is at the top of the food chain with no natural predators. This means great whites have their pick of food when it comes to selecting their prey (Klimley 15).

Carcharodon carcharias, better know as the great white shark, have existed as a group for over 350 million years (Long). Its name means “ragged-toothed” (Gorman 10). The largest white shark on record was 21 feet long and weighed 7302 pounds. Its ancestors, now extinct, were three times this size, with teeth that were six inches long (White Shark). Today sharks are represented by over 600 species (Long). Great whites are part of a grouping know as mackerel sharks, a grouping which includes the salmon, porbeagle, and maco shark (MacGregor 46). Unlike the true fishes, sharks do not have internal bone, but instead have a cartilaginous skeleton (Long). This stiff flexible material is found in the ridge of your nose and in your earlobes. Because cartilage does not leave fossil remains like bones, there are no fossils of ancient sharks- just their teeth (Klimley 56). Little is known about great whites because they are enormous, bulky, and hard to handle. And that’s when they’re dead. Their body temperature is sometimes ten to fifteen degrees [Celsius] warmer than the surrounding water, which makes them efficient predators in cool water (Gorman 15). The back of the shark is a dull gray color and the underside is colored white. The tail is crescent shaped. There are five gill slits on great white sharks. Studying a live great white shark up close and in detail is, for obvious reasons, practically impossible (Sanders 31).

The great white is the only shark that can hold its head above water to see what is happening on the surface (MacGregor 47). It has been said that sharks do not swim through water as much as they “fly” through it with their torpedo like body (Gorman 25). The fins of a shark serve important roles in this action. As the shark moves the Caudal, back, fin to propel it forward, careful adjustment of the pectoral, side,...

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Uploaded by:   Admin

Date:   03/09/2001

Category:   Animals

Length:   10 pages (2,182 words)

Views:   2584

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