Photo taken on April, 4, 2017 shows a Przewalski's horse in a field of the Domain of the Caves of Han, Belgium. Two Przewalski's horses left the Domain of the Caves of Han to be transported to Prague Zoo on Tuesday. After inspection and quarantine, one of them will be sent to northwest China's Xinjiang Uygur Autonomous Region this September for breeding. (Xinhua/Gong Bing)
