Photo taken on June 5, 2018 shows the male cub of the male-female panda twins at the Chengdu Research Base of Giant Panda Breeding in southwest China's Sichuan Province. Panda Ya Yun gave birth to the first male-female panda twins of this year Tuesday morning. The female cub weighed 135.3 grams and was born at 8:20 a.m. The male cub followed nine minutes later, weighing 148.8 grams. (Xinhua)