Herd moving forward along road during migration in Qinghai

Aerial photo taken on Sept. 14, 2017 shows a herd of cattle and sheep moving forward along a road during the annual migration period in Guinan County, northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Sept. 14, 2017 shows a herd of cattle and sheep moving forward along a road during the annual migration period in Guinan County, northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Sept. 14, 2017 shows a herd of cattle and sheep moving forward along a road during the annual migration period in Guinan County, northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Sept. 14, 2017 shows a herd of cattle and sheep moving forward along a road during the annual migration period in Guinan County, northwest China's Qinghai Province. (Xinhua/Wu Gang)

Aerial photo taken on Sept. 14, 2017 shows a herd of cattle and sheep moving forward along a road during the annual migration period in Guinan County, northwest China's Qinghai Province. (Xinhua/Wu Gang)