With catchy rhyming text, author Karen Shapiro gives readers a very simple lesson in the process of metamorphosis from caterpillar to butterfly. The spare text, paired with illustrator Jean Cassels' vivid realistic art, follows the fascinating process step-by-step. Readers see the caterpillar being born, eating, growing, shedding skin, gradually changing form inside a chrysalis, then emerging as a beautiful butterfly. The last page of the book catalogs the many different kinds of butterflies that appear inside, each of them identified with their correct names.