![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/d7f2582fba8c4cc8b4eb6b8d835f6d93.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)
![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/3df1d39c72cf4615b1671a41b400057b.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)
![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/89cd5e157c984289aed6562bc6db4e61.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)
![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/0b3db3bb0e11480aa9770ac20b023172.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)
![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/3116b134ef794dcab28a52d85cf73c19.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)
![Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China\'s Heilongjiang Province. (Xinhua/Wang Jianwei)](http://www.ecns.cn/hd/2019/04/16/442fb77bd1204d8087413f237b714a4f.jpg)
Photo taken on April 15, 2019 shows mandarin ducks at Zhaolin Park in Harbin, northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)