Red-crowned cranes are seen at the Zhalong National Nature Reserve in Qiqihar, Northeast China’s Heilongjiang province, June 25, 2015. [Photo/Xinhua]

Red-crowned cranes are seen at the Zhalong National Nature Reserve in Qiqihar, Northeast China’s Heilongjiang province, June 25, 2015. [Photo/Xinhua]

Red-crowned cranes are seen at the Zhalong National Nature Reserve in Qiqihar, Northeast China’s Heilongjiang province, June 25, 2015. [Photo/Xinhua]

Red-crowned cranes are seen at the Zhalong National Nature Reserve in Qiqihar, Northeast China’s Heilongjiang province, June 25, 2015. [Photo/Xinhua]

Red-crowned cranes are seen at the Zhalong National Nature Reserve in Qiqihar, Northeast China’s Heilongjiang province, June 25, 2015. [Photo/Xinhua]