Breeders present a birthday cake to Xinxing, world's oldest captive giant panda, at a zoo in southwest China's Chongqing, Aug. 23, 2019. Chongqing Zoo on Friday threw a birthday party for its celebrity "granny panda" who turned 37, equivalent to more than 100 human years. Xinxing, born in Sichuan Province in 1982, is the world's oldest captive giant panda. (Xinhua/Tang Yi)