![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/f3d8c75b53ef4d208410e05c6c2c954d.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/2407a384c59e4b4eb0f7d162fff0aa24.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/b84503a2b24540dfb51aacd20362e86b.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/90a188edbfc840f28b2adb3b504b8f8e.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/4c5deb56262a4a75a3acd7af9a0e8109.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/e9321f8542d4415ab064d9675b3dedc9.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/538d24c38dd2416a99acc870e9aac3b0.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans flying above the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/f76d061b13dd45c0871cd95494f9093a.jpg)
Photo taken on March 12, 2019 shows swans flying above the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)
![Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China\'s Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)](http://www.ecns.cn/hd/2019/03/15/6b0736572b6940ddbccb526ab8f931c3.jpg)
Photo taken on March 12, 2019 shows swans at the Yellow River wetland in Dalad Qi, Ordos, north China's Inner Mongolia Autonomous Region. (Xinhua/Peng Yuan)