Zhan Yanbao, a researcher of Xinjiang Wild Horse Breeding and Research Centers, strokes a Przewalski's horse in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)

Gao Shouqin, breeder of Xinjiang Wild Horse Breeding and Research Center, cleans a water trough in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 24, 2021.(Photo: Xinhua)

Zhan Yanbao (R), a researcher of Xinjiang Wild Horse Breeding and Research Center, feeds Przewalski's horses in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)

Zhan Yanbao, a researcher of Xinjiang Wild Horse Breeding and Research Center, carries out a trial of wild exercising on Przewalski's horses in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)

Staff of Xinjiang Wild Horse Breeding and Research Center, feed Przewalski's horses in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)

Breeders of Xinjiang Wild Horse Breeding and Research Center transport fodder for Przewalski's horses in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)

Zhan Yanbao, a researcher of Xinjiang Wild Horse Breeding and Research Center, observes Przewalski's horses through surveillance cameras in Jimsar County, northwest China's Xinjiang Uygur Autonomous Region, April 21, 2021.(Photo: Xinhua)