![Three Chinese crested terns play on the wetland of the Minjiang River in southeast China\'s Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/8270744610db407caba06df6ea8e997f.jpg)
Three Chinese crested terns play on the wetland of the Minjiang River in southeast China's Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![A Chinese crested tern forages on the wetland of the Minjiang River in southeast China\'s Fujian Province, July 4, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/446c7334490948cca07b57bc8b136369.jpg)
A Chinese crested tern forages on the wetland of the Minjiang River in southeast China's Fujian Province, July 4, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![A Chinese crested tern forages on the wetland of the Minjiang River in southeast China\'s Fujian Province, July 4, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/ca9544c581c546e2b36a4eb94ef2dcdb.jpg)
A Chinese crested tern forages on the wetland of the Minjiang River in southeast China's Fujian Province, July 4, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![Two Chinese crested terns fly over the wetland of the Minjiang River in southeast China\'s Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/803dff71761d4f60bc6179555983c186.jpg)
Two Chinese crested terns fly over the wetland of the Minjiang River in southeast China's Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![Two Chinese crested terns play on the wetland of the Minjiang River in southeast China\'s Fujian Province, June 2, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/d4a3ab545f0f41ceb83d66bbd0994c8c.jpg)
Two Chinese crested terns play on the wetland of the Minjiang River in southeast China's Fujian Province, June 2, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![Two Chinese crested terns play on the wetland of the Minjiang River in southeast China\'s Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/fc449820cc7c4437832df58ddb365ed0.jpg)
Two Chinese crested terns play on the wetland of the Minjiang River in southeast China's Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![A Chinese crested tern forages on the wetland of the Minjiang River in southeast China\'s Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/a0fa50529d954fd6aa50a7a93929c51b.jpg)
A Chinese crested tern forages on the wetland of the Minjiang River in southeast China's Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)
![Two Chinese crested terns play on the wetland of the Minjiang River in southeast China\'s Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)](http://www.ecns.cn/hd/2018/07/06/f3981920db61438e9b90b57cf7effb10.jpg)
Two Chinese crested terns play on the wetland of the Minjiang River in southeast China's Fujian Province, June 3, 2018. The Chinese crested tern is a critically endangered species. (Xinhua/Mei Yongcun)