Dear Zoo: A Lift-the-Flap Book by Rod Campbell This book is one of my baby’s favorite books. He loves to turn the pages and lift the flaps. He also says “ssssss” when we get to the page with the snake. After almost a year of use, the flaps still work with only a few wrinkles in them.   Animals in this book include the following. Follow the link to learn the corresponding ASL sign.