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Photo taken on Sept. 6, 2010 shows fossilized elephant teeth discovered in Enshi Tujia and Miao Autonomous Prefecture, central China's Hubei Province. Elephant fossils, dating back to 500,000 years, were discovered at Enshi on Sept. 1, 2010. (Xinhua/Song Wen)

Photo taken on Sept. 6, 2010 shows fossilized elephant teeth discovered in Enshi Tujia and Miao Autonomous Prefecture, south China's Hubei Province. Elephant fossils, dating back to 500,000 years, were discovered at Enshi on Sept. 1, 2010. (Xinhua/Song Wen)

A staff member of Xuan'en Museum introduces the fossils discovered in Enshi Tujia and Miao Autonomous Prefecture, central China's Hubei Province. Elephant fossils, dating back to 500,000 years, were discovered at Enshi on Sept. 1, 2010. (Xinhua/Song Wen)

Photo taken on Sept. 6, 2010 shows fossilized elephant skull discovered in Enshi Tujia and Miao Autonomous Prefecture, south China's Hubei Province. Elephant fossils, dating back to 500,000 years, were discovered at Enshi on Sept. 1, 2010. (Xinhua/Song Wen)