Giant panda twins "Ping Ping" (R) and "An An" eat a cake to celebrate their birthday at the Bifengxia breeding base in Ya'an City of southwest China's Sichuan Province, July 6, 2009. [Jiang Hongjing/Xinhua]
![Giant panda twins 'Ping Ping' (R) and 'An An' eat a cake to celebrate their birthday at the Bifengxia breeding base in Ya'an City of southwest China's Sichuan Province, July 6, 2009. [Jiang Hongjing/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20090707/000bcdb95f1d0bbcddb303.jpg "Giant panda twins 'Ping Ping' (R) and 'An An' eat a cake to celebrate their birthday at the Bifengxia breeding base in Ya'an City of southwest China's Sichuan Province, July 6, 2009. [Jiang Hongjing/Xinhua]")
