The first 100 Days of Mei Lun and Mei Huan

One hundred days of "Cub A" and "Cub B" are over, and the twin giant panda cubs have officially been named Mei Lun and Mei Huan.

Born July 15, 2013, Mei Lun and Mei Huan are the first surviving pair of giant panda twins ever born in the U.S. and are the fourth and fifth offspring of Lun Lun and Yang Yang.