Giant panda Yuan Yuan enjoys a special birthday cake in Taipei Zoo in Taipei, southeast China's Taiwan, Aug. 30, 2016. Born two days later than Yuan Yuan in 2004, giant panda Tuan Tuan also celebrated its 12th birthday together with Yuan Yuan on Tuesday. Yuan Yuan and Tuan Tuan were given as a goodwill gift to Taiwan by the Chinese mainland in 2008. They had their first cub, Yuan Zai, on July 6, 2013. (Xinhua/Song Zhenping)