Red-crowned cranes are seen at Zhalong National Nature Reserve in Qiqihar, northeast China's Heilongjiang Province, July 23, 2019. Zhalong National Nature Reserve is a major habitat for red-crowned cranes.(Photo: Xinhua)

Red-crowned cranes are seen at Zhalong National Nature Reserve in Qiqihar, northeast China's Heilongjiang Province, July 23, 2019. Zhalong National Nature Reserve is a major habitat for red-crowned cranes. (Photo: Xinhua)

Red-crowned cranes are seen at Zhalong National Nature Reserve in Qiqihar, northeast China's Heilongjiang Province, July 23, 2019. Zhalong National Nature Reserve is a major habitat for red-crowned cranes. (Photo: Xinhua)