 He is the mate to Lun Lun and the father to Mei Lan, Xi Lan, Po, twins Mei Lun and Mei Huan and two new female twins, Ya Lun and Xi Lun.Yang Yang was born at the Chengdu Research Base of Giant Panda Breeding and has been on loan to Zoo Atlanta since November 1999.He was originally named Jiu Jiu, until his "adoption" by three organizations in the Netherlands.