Blue sheep eat grass near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)

Blue sheep eat grass near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)

A blue sheep eats grass near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)

A blue sheep eats grass near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)

Blue sheep eat fruits near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years.(Photo: Xinhua)

Blue sheep rest near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)

A blue sheep eats fruits near a mountain road in Lhozhag County, Shannan City, southwest China's Tibet Autonomous Region, Sept. 22, 2019. The population of blue sheep, under the second-level state protection in China, grows thanks to the continuous protection efforts in recent years. (Photo: Xinhua)