Female African elephant Zhouzhou prepares for her trip to Beijing to mate with the male elephant Zhuangzhuang, at the Nanning Zoo, Nanning, South China's Guangxi Zhuang autonomous region, on May 24, 2013. Two 18-year-old female elephants, Feifei and Zhouzhou from the Nanning Zoo, both weighing 2,000 kilograms, will be moved to the Beijing Zoo to mate with Zhuangzhuang. Zhouzhou will travel from Nanning in a 13-meter "wedding cage" and Feifei will travel from Liuzhou, South China's Guangxi Zhuang autonomous region. Zoo employees hope the reproduction of elephants can add to the population of the endangered African species. [Photo/CFP]