A tourist takes photos of migratory birds at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province, April 2, 2026. (Xinhua/Li Gang)

A tourist takes photos of migratory birds at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province, April 2, 2026. (Xinhua/Li Gang)

This photo taken on April 2, 2026 shows migratory birds at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province. (Xinhua/Li Gang)

This photo taken on April 2, 2026 shows the sunrise scenery at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province. (Xinhua/Li Gang)

Tourists view migratory birds at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province, April 2, 2026. (Xinhua/Li Gang)

A tourist takes photos of migratory birds at a migratory bird habitat on the Yalu River estuary in Dandong, northeast China's Liaoning Province, April 2, 2026. (Xinhua/Li Gang)