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What type of animal is a shark?

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Basking sharks, whale sharks, and megamouth sharks have independently evolved different strategies for filter feeding plankton: basking sharks practice ram feeding, whale sharks use suction to take in plankton and small fishes, and megamouth sharks make suction feeding more efficient by using the luminescent tissue inside of their mouths to attract prey in the deep ocean. read more

The practice of "shark finning" has resulted in a significant decline in the population of some sharks. Tiger sharks, for example, are currently ranked as "near threatened," and sawfish are critically endangered (that's one step above "extinct in the wild"). read more

Sharks are not mammals. Rather, they are a species of fish because they have a skeleton that is entirely composed of cartilage and is equipped with tough, leathery, scale less skin. These skeletons differ greatly from those of the bony fish or other terrestrial vertebrates. read more

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