The photo shows migratory birds flying over the winter. (Photo by Teng Zhong) The photo shows migratory birds overwintering alongside staff. (Photo by Teng Zhong) Photo shows migratory birds overwintering. (Photo by Teng Zhong) Photo shows migratory birds overwintering. (Photo by Teng Zhong) The photo shows migratory birds foraging on the beach during the winter. (Photo by Teng Zhong) The photo shows migratory birds foraging for food during the winter. (Photo by Teng Zhong)