CHENGDU, CHINA - SEPTEMBER 02: <br />
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The male panda \"Panpan\" eats his birthday present - \"bamboo cake\" during her 31st birthday celebration on September 2, 2016 in Chengdu, Sichuan Province of China. \"Panpan\", the eldest male panda in the World, celebrated his 31-year-old birthday at the Panda Conservation Center in Chengdu. One year for a panda is equivalent to three or four years for a human being.<br />
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