Migratory birds fly above the Lhasa River wetland in southwest China's Tibet Autonomous Region, November 26, 2008. Tens of thousands of migratory birds have flied to the Lhasa River wetland recently to spend their winter days.

Migratory birds fly above the Lhasa River wetland in southwest China's Tibet Autonomous Region, November 26, 2008. Tens of thousands of migratory birds have flied to the Lhasa River wetland recently to spend their winter days.

Migratory birds rest on the Lhasa River in southwest China's Tibet Autonomous Region, November 26, 2008. Tens of thousands of migratory birds have flied to the Lhasa River wetland recently to spend their winter days.

Migratory birds play with each other above the Lhasa River in southwest China's Tibet Autonomous Region, November 25, 2008. Tens of thousands of migratory birds have flied to the Lhasa River wetland recently to spend their winter days.

(Xinhua News Agency November 28, 2008)