What is one and only ivan?

One and Only Ivan is a children's novel written by Katherine Applegate. The story revolves around a silverback gorilla named Ivan who has spent most of his life in a small cage in a shopping mall circus. The story is told from Ivan's perspective as he reflects on his past and present life and the memories he shares with his animal friends at the circus.

The book highlights themes such as animal rights, friendship, and the importance of family. The story is based on a true story of a gorilla who was found living in deplorable conditions in a shopping mall and was subsequently moved to a zoo.

The book was published in 2012 and won numerous accolades, including the John Newbery Medal, which is awarded to the most distinguished children's book of the year. The book was adapted into a feature film by Walt Disney Pictures and was released on Disney+ in 2020.