Essay on Sharks

Essay on Sharks

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Sharks


Sharks are one of the most feared carnivores in the sea. There are 365 species of of sharks in the sea as we know today. All sharks are carnivores. Most of them eat live fish, including other sharks. A shark's most common natural enemy is an another shark. Most sharks eat their prey whole, or they tear off large chunks of the bodies. Some sharks crush their prey. Others take out small pieces off flesh from large fish. Sharks also feed on dead or dying animals. Sharks have the reputation of attacking human beings. But less than 100 shark attacks a year are reported throughout the world. Sharks are most common in warm seas and oceans. Whale sharks, are the largest shark known to man. Sharks are classified in the order Selachii, which belongs to a larger class of fish called Elasmobranchi. The earliest shark-like vertebrate fossils are from the Devonian Period of the Paleozoic Era.

Some kinds of sharks live in the depths of the ocean. The smallest streamlined, black and white shark of the genus Squaliolus can grow to be up to 6 inches long and the female can grow to be up to 8 inches. They can grow up to 40 feet long. They are also known to weigh over 15 tons. The smallest sharks known at a full stage of growth may measure about 6 inches long and weigh about 1 ounce.

Sharks live in many places throughout the ocean. Some sharks are known to be found near the surface of the water because the temperature of the water is warmer. Yet, some sharks are known to dwell on the bottom of the ocean. These sharks are sometimes referred to as bottom dwellers. A few species of sharks enter rivers and lakes where they can move to the seas and oceans easily.

Sharks have a boneless skeleton made of a substance called car...


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4. Sharks eat far less than most people imagine. Cold-blooded animals have a much lower metabolism than warm-blooded animals. A shark eats about 1% to 10% of its total body weight each week. Studies on sharks in the wild show similar food intake.
5. Only 32 shark species have ever been known to attack people. Like other wild animals, most sharks would rather avoid you. Sharks that have attacked, probably mistook people for food or may have attacked to protect their territory.







Bibliography:

Refrences


All About Sharks 3-15
Http://www.aj.com/main/metaanswer.asp?metaEngine=directhit&origin

Encyclopedia Americana- School's Version 3-30

SHARKS!- 2-18 A Web Site with many new facts and information.
Http://www.sharks.com/info

McMillian's Animal Kingdom 3-26
P.145-149

Discover Channel Online
www.discoveryonline.com/sharkcam

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