This photo taken on September 21, 2015 shows giant panda Pan Pan sniffing a birthday cake made of ice for his 30th birthday at the China Conservation and Research Centre for the Giant Panda in Dujiangyan, southwestern China's Sichuan Province. The world's oldest male panda, with more than 130 descendants -- a quarter of all the captive-bred pandas on the planet -- has died aged 31, officials said on December 29, 2016. / AFP PHOTO / STR / China OUT