Two giant pandas in a zoo in southwest China's Chongqing Municipality gave birth to two pairs of twins on June 23, the zoo said Tuesday. Female panda Lanxiang, 17, gave birth to a pair of male cubs in the wee hours that weighed 167 and 115 grams, respectively. Another female panda, Mangzai, gave birth to a pair of female cubs in the afternoon on the same day, measuring 142 and 160 grams in weight, respectively.