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 Compared to most other animals, dolphins are  believed to be  very intelligent. 
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 Dolphins are carnivores (meat eaters). 
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 The Killer Whale (also known as Orca) is actually a  type of  dolphin. 
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 Bottlenose dolphins are the most common and well  known type  of dolphin. 
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 Female dolphins are called cows, males are called  bulls and  young dolphins are called calves. 
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 Dolphins live in schools or pods of up to 12  individuals. 
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 Dolphins often display a playful attitude which  makes them  popular in human culture. They can be seen jumping out of  the water, riding  waves, play fighting and occasionally interacting  with humans swimming in the  water. 
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 Dolphins use a blowhole on top of their heads to  breathe. 
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 Dolphins have excellent eyesight and hearing as  well as the  ability to use echolocation for finding the exact location  of objects. 
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 Dolphins communicate with each other by clicking,  whistling  and other sounds. 
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 Some dolphin species face the threat of extinction,  often  directly as a result of human behavior. The Yangtze River  Dolphin is an example  of a dolphin species which may have recently  become extinct. 
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 Some fishing methods, such as the use of nets, kill  a large number of  dolphins every year. 
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