A blue sheep is seen in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 30, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
Blue sheep look on in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 29, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
Blue sheep run in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 29, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
A blue sheep runs in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 29, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
A blue sheep looks on in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 30, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
A blue sheep is seen in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 30, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
A blue sheep looks on in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 30, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)
A blue sheep looks on in the Helan mountain area in northwest China's Ningxia Hui Autonomous Region, May 30, 2013. Helan mountain area has become world's heaviest inhabited area for blue sheep as the number reached over 20,000 currently due to enhanced wildlife reservation. (Xinhua/Li Ran)