In this January 2010 photo provided by the journal Nature via Przewalski's Horse Association, a Przewalski's horse is shown in Khomyntal, western Mongolia, in one of three reintroduction sites. From a tiny fossil bone found in the frozen Yukon, scientists have deciphered the genetic code of an ancient horse about 700,000 years old _ nearly 10 times older than any other animal that has had its genome mapped. The researchers also found new evidence that the endangered Przewalski's horse, found in Mongolia and China, is the last surviving wild horse. It is genetically distinct from domestic horses. (AP Photo/Przewalski's Horse Association via Nature, Claudia Feh)
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