A drone photo taken on March 15, 2026 shows migratory birds flying at sunrise in Bohai Town, Ning'an City of Mudanjiang, northeast China's Heilongjiang Province. (Photo by Wang Baoxun/Xinhua)

Migratory birds fly over the waters of a wetland park in Tailai County of Qiqihar City, northeast China's Heilongjiang Province, March 14, 2026. (Photo by Zhang Yanbo/Xinhua)

An aerial drone photo taken on March 17, 2026 shows herons resting by the waters in Bohai Town, Ning'an City of Mudanjiang, northeast China's Heilongjiang Province. (Photo by Wang Baoxun/Xinhua)