The One and Only Ivan by Katherine Applegate

Why do I keep reading books with animals? One usually dies and that is the case in this one. Sigh.

Ivan is a silverback gorilla who lives in a shopping mall as a tourist attraction along with an elephant and dog. One day, a new baby elephant, Ruby, arrives, and Ivan is determined to make sure that Ruby lives a different kind of life.

Very sweet and touching. Plus, it has a very happy ending!