The Very Hungry Caterpillar, written by Eric Carle, is about a caterpillar who has a huge appetite. As each day past, he eats more than the precious day. On the last day of the week, once he is done eating, he builds its cocoon and turns into a beautiful butterfly. I can use this book in my classroom when teaching the days of the week and numbers! I can go back and do a picture walk and count how many food items that the caterpillar ate on each page, connect the number to the illustration.