XI'AN, Dec. 17, 2014 (Xinhua) -- Crested ibis, an endangered bird species once believed to be extinct in China, fly in the forest at Tongchuan City, northwest China's Shaanxi Province, Dec. 16, 2014. The number of crested ibis in Shaanxi province has increased from 7 in 1981 to more than 2,000 by now.

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