The series spans four books, following the lives of three unlikely friends: Ivan the gorilla, Bob the dog, and Ruby the elephant.
The title "One and Only" most famously refers to Katherine Applegate's , a Newbery Medal-winning series of middle-grade novels inspired by the true story of Ivan, a silverback gorilla who lived in a Washington shopping mall for 27 years. One And Only
: Everything changes when Ruby , a baby elephant, arrives at the mall. Seeing the habitat through her eyes, Ivan realizes they deserve better than a life of captivity. The series spans four books, following the lives