A picture book depicting a boy's adventure at the zoo and the secrets of the animals. - Title: Secrets in the Cage - Author: Jeanne Willis - Translator: Shigeki Chiba - ISBN: 9784751521960 - Publisher: Asunaro Shobo - Content introduction: A story about a boy who goes to the zoo. He learns the secrets of the animals who don't speak. The sign language between the boy, who can hear but cannot speak, and the gorilla is impressive. There really was a gorilla who could use sign language. First, I want adults to read this. It's poignant and touching. I think children from upper elementary school age and up will be able to understand it. I definitely want you to read it during the winter break.