Ei Mei lives in Adventure World, Shirahama, Nishimuro, Japan. He was born in the Beijing Zoo, September 14, 1992 and arrived in Japan in 1994. He was the breeding partner of Mei Mei up until Mei's death on October 15, 2008. Ei was successful in naturally mating with Mei Mei for all of their offspring. Together they had six cubs which included two sets of twins.