File photo taken on Nov. 11, 2009 shows the Mesopithecus fossils unearthed from Zhaotong, southwest China's Yunnan Province. Scientists from China, the United States, Greece and Australia have confirmed the discovery of a collection of Mesopithecus fossils dating back about 6.4 million years in southwest China's Yunnan Province. (Photo by Wang Yi/Xinhua)
