Giant pandas play at the Ya'an base of the China Giant Panda Protection and Research Center in southwest China's Sichuan Provice, Oct. 21, 2009. A total of 10 giant pandas from the Ya'an base will be brought to Shanghai and put on display during the 2010 Shanghai World Expo.(Xinhua Photo)

Giant pandas play at the Ya'an base of the China Giant Panda Protection and Research Center in southwest China's Sichuan Provice, Oct. 21, 2009. A total of 10 giant pandas from the Ya'an base will be brought to Shanghai and put on display during the 2010 Shanghai World Expo.
(Xinhua Photo)

Giant pandas play at the Ya'an base of the China Giant Panda Protection and Research Center in southwest China's Sichuan Provice, Oct. 21, 2009. A total of 10 giant pandas from the Ya'an base will be brought to Shanghai and put on display during the 2010 Shanghai World Expo. (Xinhua Photo)