A waterfowl is seen in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 29, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

A waterfowl swims in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 30, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

Waterfowls swim in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 30, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

A waterfowl swims in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 30, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

A waterfowl is seen in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 29, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

Waterfowls are seen in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 26, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

Waterfowls swim in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 28, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

A bird is seen in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 29, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

A waterfowl flies over the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 26, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)

Waterfowls are seen in the Three Gorges Reservoir in Yunyang County in Southwest China's Chongqing, March 26, 2013. Improved environment near the reservoir has allowed superb conditions for birds to live. (Xinhua/Chen Jianhua)