Each spread of Big and Little shows animals that are related to each other but vary greatly in size. All animals are illustrated on the same scale, so readers can compare them throughout the book. Illustrates the concept of size by comparing different animals, from the smallest visible animals to the largest.Each spread of Big and Little shows animals that are related to each other but vary greatly in size. All animals are illustrated on the same scale, so readers can compare them throughout the book. Illustrates the concept of size by comparing different animals, from the smallest visible animals to the largest.