One of the twin cubs born by the American-born female giant panda Hua Mei sleeps in an attemperator at the China Wolong Giant Panda Protection and Research Center in southwest China¡¯s Sichuan Province Sept. 27, 2004. Giant panda Hua Mei, who did not know how to feed her babies after giving birth to them, learned some basic skills in the nursing of cubs in a 7-day training session held by the staff of the research center. Now, Hua Mei and the personnel of the China Wolong Giant Panda Protection and Research Center take care of the two cubs in alternation of five days. (Xinhua Photo/Chen Xie)

The American-born female giant panda Hua Mei puts one of her cubs in the arms at the China Wolong Giant Panda Protection and Research Center in southwest China¡¯s Sichuan Province Sept. 27, 2004.(Xinhua Photo/Chen Xie)