Migratory birds fly over the Yellow River Delta National Nature Reserve in Dongying City, east China"s Shandong Province, Oct. 26, 2026. The Yellow River Delta is a key area for the conservation of migratory waterbirds along international flyways. Of the world"s nine major migratory routes, two pass through this region. Millions of birds pass through each year, earning the delta a reputation as an "international airport" for avian travelers. (Xinhua/Zhu Zheng)

　　(Web editor: Zhang Kaiwei, Liang Jun)