The scientific name for a cow is Bos Taurus. The common name is Bovine. Cows are used as a food source. They also are used for leather and their dung is used for fuel. You can find more information here: http://www.uniprot.org/taxonomy/9913
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There are actually more famous cows than most people think. There is Amy which was cloned in the U.S. in 1999. Elsie is the Jersey cow for Borden's and Laughing Cow is the mascot for Laughing Cow cheese.