LANZHOU -- Hundreds of bharals, also called the Helan Mountain blue sheep, were captured in a video recorded in Qilian Mountain National Park, Northwest China's Gansu province, local authorities said Tuesday.

Footage showed bharals climbing over the mountains and racing toward the no-grazing area of the Shandan Horse Ranch under China National Agricultural Development Group.

In recent years, the population of wild animals in the park has proliferated thanks to dwindling human activities. However, it is still rare to see such a large number of bharals, and their presence indicates the continuous improvement of the local ecological environment, said Ma Duifang, an official with the park administration.

The blue sheep are wild animals under Class Two national protection and usually reside in areas with bare rocks about 2,100 meters to 6,300 meters above sea level in the Northwest and Southwest China. As they are good at climbing cliffs, the species is also dubbed "cliff fairies" in China.

The pilot national park covers an area of 50,200 square km, including 34,400 square km in Gansu province and 15,800 square km in neighboring Qinghai Province.