Panda Yuanyuan enjoys her birthday cake in the zoo in Taipei of southeast China's Taiwan Province, Aug. 30, 2009. Pandas Tuantuan and Yuanyuan were celebrating their fifth birthday in succession after eight months moved from Ya'an of southwest China's Sichuan Province. Yuanyuan was born on Aug. 30, 2004 and Tuantuan on Sept. 1 of the same year. [Xinhua]