Tourists view artificially-bred red-crowned cranes at the Zhalong Natural Reserve in Qiqihar, northeast China's Heilongjiang Province, June 5, 2013. Being the largest breeding and wildness training reserch center for red-crowned cranes, the reserve has artificially bred over 800 cranes of the endangered species since its foundation in 1979. (Xinhua/Liang Dong)

Tourists view artificially-bred red-crowned cranes at the Zhalong Natural Reserve in Qiqihar, northeast China's Heilongjiang Province, June 5, 2013. Being the largest breeding and wildness training reserch center for red-crowned cranes, the reserve has artificially bred over 800 cranes of the endangered species since its foundation in 1979. (Xinhua/Liang Dong)

Tourists view artificially-bred red-crowned cranes at the Zhalong Natural Reserve in Qiqihar, northeast China's Heilongjiang Province, June 5, 2013. Being the largest breeding and wildness training reserch center for red-crowned cranes, the reserve has artificially bred over 800 cranes of the endangered species since its foundation in 1979. (Xinhua/Liang Dong)

Tourists view artificially-bred red-crowned cranes at the Zhalong Natural Reserve in Qiqihar, northeast China's Heilongjiang Province, June 5, 2013. Being the largest breeding and wildness training reserch center for red-crowned cranes, the reserve has artificially bred over 800 cranes of the endangered species since its foundation in 1979. (Xinhua/Liang Dong)

Tourists view artificially-bred red-crowned cranes at the Zhalong Natural Reserve in Qiqihar, northeast China's Heilongjiang Province, June 5, 2013. Being the largest breeding and wildness training reserch center for red-crowned cranes, the reserve has artificially bred over 800 cranes of the endangered species since its foundation in 1979. (Xinhua/Liang Dong)