Allison Shearmur, who was one of the producers on Disney's live-action take on "Cinderella" as well as "Rogue One: A Star Wars Story", is on board to produce the adaptation, according to The Hollywood Reporter.
Published by HarperCollins in 2011, the book centers on a silverback gorilla named Ivan who lives in a cage in a shopping mall along with an elephant named Stella and a stray dog called Bob.
Applegate, who also created the late 1990s book series Animorphs with her husband, Michael Grant, based the story on a real-life gorilla named Ivan who spent 27 years in a Washington mall before being transferred to the Atlanta Zoo.