The Zoo says goodbye to beloved pandas Bai-Yun and Xiao Liwu as mother and cub prepare to return to China. Tembo the retired "Hollywood" elephant tries traditional Chinese medicine for her arthritis. The Butterfly Jungle gets colored for the season.

Safari Park keepers say goodbye to two elephant brothers; a look at if the San Diego Zoo vets can design a custom shoe for Felix, an excitable three-toed Baird's Tapir; two African penguin chicks grow up and get ready to join the colony.