The Hungry Caterpillar - thick pages / Carl Eric Eric Carl believes that learning should be done through an entertaining experience, and he fulfills this perfectly in the many picture books he created. This picture book, intended for preschoolers, describes in an entertaining way the process of changing the shape of a small caterpillar until it becomes a colorful butterfly. While enjoying flipping through the cut and perforated pages, and from the colorful collages, the child learns a process in nature, the days of the week, counting to ten and even gets a small lesson in nutrition.