A cattle egret (Bubulcus ibis) hovers above an island in Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

Water birds fly above Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

A blooming lotus is seen in Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

Bird nests are seen from a tree on an island in Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

Water birds fly above Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

Two little egrets (Egretta garzetta) look for food in Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

A cattle egret (Bubulcus ibis) hovers above an island in Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand, April 30, 2015. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)

Photo taken on April 30, 2015 shows Bueng Boraphet, a freshwater swamp and lake in Nakhon Sawan, central Thailand. Covering an area of 212.38 square kilometers, Bueng Boraphet is home to nearly 200 animal and plant species. The lake is a destination for migrating birds between September and March. (Xinhua/Li Mangmang)