This book is a charming combination of art and science which explores the symbiotic relationship between two unlikely creatures.  The format is an absolute bonus, each page uniquely set with a combination of cartoon type illustrations which include bits of information to tell the story of the two animals and how they mutually benefit one another. The illustrations are beautifully done and will carry reluctant or very young readers and the writing is perfect for fourth grade reading levels.  It will be easy enough to follow the information while being exposed to new and challenging vocabulary.  This book will hold the interest of the young and the adults who are “sharing” the story.  Beautifully composed.  This book is highly recommended.