Beijing, April 30 (Youth.cn) - On April 29, 2026, in Dingxi City, Gansu Province, a flock of black-winged stilts were circling and dancing over Dingxi Lake. Black-winged stilts stop to forage during their spring and autumn migrations. With the continuous improvement of the Dingxi Lake wetland ecosystem, it has become an important stopover habitat for various migratory waterbirds. Photo/CFP