Photo taken on Oct. 24, 2008 shows giant panda cubs sleep at the Bifengxia Base of the Chinese Giant Panda Research and Protection Center, in Ya'an County, southwest China's Sichuan Province. More than 30 giant pandas were transferred to the Bifengxia base from the Chinese Giant Panda Research and Protection Center in Wolong of Sichuan after the May 12 massive quake. Thirteen cubs were born at the Bifengxia base since July 6th. (Xinhua Photo/Chen Xie)
A girl tends a giant panda cub at the Bifengxia Base of the Chinese Giant Panda Research and Protection Center, in Ya'an County, southwest China's Sichuan Province, Oct. 24, 2008. More than 30 giant pandas were transferred to the Bifengxia base from the Chinese Giant Panda Research and Protection Center in Wolong of Sichuan after the May 12 massive quake. Thirteen cubs were born at the Bifengxia base since July 6th.(Xinhua Photo/Chen Xie)
Photo taken on Oct. 24, 2008 shows giant panda twins cubs "Ping Ping" and "An An" were tended by their mother "Guo Guo" at the Bifengxia Base of the Chinese Giant Panda Research and Protection Center, in Ya'an County, southwest China's Sichuan Province. More than 30 giant pandas were transferred to the Bifengxia base from the Chinese Giant Panda Research and Protection Center in Wolong of Sichuan after the May 12 massive quake. Thirteen cubs were born at the Bifengxia base since July 6th.(Xinhua Photo/Chen Xie)
Photo taken on Oct. 24, 2008 shows giant panda twins cubs "Ping Ping" and "An An" stay with their mother "Guo Guo" at the Bifengxia Base of the Chinese Giant Panda Research and Protection Center, in Ya'an County, southwest China's Sichuan Province. More than 30 giant pandas were transferred to the Bifengxia base from the Chinese Giant Panda Research and Protection Center in Wolong of Sichuan after the May 12 massive quake. Thirteen cubs were born at the Bifengxia base since July 6th.(Xinhua Photo/Chen Xie)
