Bharal seen at Helan Mountain National Nature Reserve in Ningxia(1/9)

Bharal, also called the Himalayan Blue sheep, is seen at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, searches for food at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, stands by a cliff at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, is seen at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan blue sheep, are seen at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan blue sheep, searches for food at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, stands by a cliff at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, searches for food at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)

Bharal, also called the Himalayan Blue sheep, search for food at the Helan Mountain National Nature Reserve in northwest China's Ningxia Hui Autonomous Region, March 27, 2019. The number of bharal has reached over 40,000 on the Helan Mountain after years of environment renovation. (Xinhua/Feng Kaihua)