Eric Carle's children's classic is the story of The Very Hungry Caterpillar is a simple one that emphasizes numbers and days of the week. The caterpillar is not only very hungry, but he also has unusual tastes in food, ones that delight children. After popping out of an egg on Sunday, the very hungry caterpillar eats holes through the book's pages as he eats his way through a variety of foods, beginning with one apple on Monday and two pears on Tuesday and ending with five oranges on Friday and 10 different foods on Saturday (chocolate cake, ice cream, a pickle, Swiss cheese, salami, a lollipop, cherry pie, sausage, a cupcake, and watermelon).

Not surprisingly, the very hungry caterpillar ends up with a stomach ache. Fortunately, a serving of one green leaf helps. The now very fat caterpillar builds a cocoon. After staying in it for two weeks, he nibbles a hole in the cocoon and emerges a beautiful butterfly. For an entertaining explanation of why his caterpillar comes out of a cocoon rather than a chrysalis, see Eric Carle's website.