[Video provided to chinadaily.com.cn]
Each migratory season, the Yellow River Delta in Dongying city – in East China's Shandong province – becomes the stage for a stunning bird migration spectacle.
This breathtaking phenomenon is characterized by vast flocks of migratory birds soaring across the sky, resembling a giant whale in motion.
The largest "wave" of birds – which includes mandarin ducks, tufted ducks and various other wild species – once reached an astounding number of 150,000 birds, an incredibly rare sight.
Watch this video to learn more about this remarkable event!