Good Night, Gorilla by Peggy Rathmann

I remember reading this book when I was in school and enjoying it even then. I reread this to my students who were engaged the whole time. We all laughed at the end. The funny Gorilla walks behind the guard who is saying good night to all the animals in the zoo. The guards wife gets a huge surprise when all the zoo animals are in their bedroom. I guarantee you will enjoy this one.