"The One and Only Ivan" by Katherine Applegate is about a silverback gorilla named Ivan who lives at a mall and video arcade told from his perspective.
Ivan has other animal friends that include an old elephant named Stella who is sick and in pain. He goes through a lot of things with his friends but he still wants to go somewhere with other gorillas because he thinks he is the only gorilla he will ever know. The mall almost closes until a new baby elephant arrives. At the mall the elephants are mistreated and Ivan and Stella don't like that another elephant will be hurt. Time goes on until Stella becomes very sick. The mall downplays her illness until she can no longer do the tricks, so doctors come to help Stella get better. In the end all the animals including Ivan go to a zoo where they are treated better and are with other animals.
I would recommend this book. It is very heartwarming but at the same time sad. I cried multiple times while reading "The One and Only Ivan". I chose to read this book because I read it before in third grade and wanted to read it again. Obviously, I could not relate to the characters who were animals. The ending is surprising and the book isn't predictable.