Photos: Zoo Atlanta panda twins celebrate 1st birthday
1 / 14
Giant panda twins Mei Lun (top) and Mei Huan rest in their enclosure at Zoo Atlanta, Wednesday, July 9, 2014. Born at 6:21 p.m. and 6:23 p.m. on the evening of July 15, 2013, Mei Lun and Mei Huan were the first giant pandas born in the U.S. in 2013 and are the only pair of surviving giant panda twins ever born in the U.S. The cubs are the fourth and fifth offspring of Lun Lun and Yang Yang; their older brothers, Mei Lan and Xi Lan, and older sister, Po, now reside at China's Chengdu Research Base of Giant Panda Breeding.