San Diego Zoo's Panda Celebrates Birthday (AP) AP - On his first birthday Thursday, giant panda cub Mei Sheng delighted visitors by playing for the first time in snow delivered to him at the San Diego Zoo. He also sat on his ice cake, wrestled with his mom, got his coat incredibly dirty, and didn't read any of the more than 700 birthday wishes sent him via e-mail from as far away as Ireland and Argentina.