A water bird flies above the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird rests on the bank of the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird rests on the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
Water birds rest on the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird rests on the bank of the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird rests on the bank of the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird rests on the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)
A water bird flies above the Yellow River in Lanzhou, capital of northwest China's Gansu Province, Jan. 2, 2019. With the improvement of environment on the upper reaches of the Yellow River, more water birds come to winter here in Lanzhou. (Xinhua/Fan Peishen)