By Karen Stray Nolting, Author & Roger Tory Peterson, Illustrator. This new series is designed with the beginner in mind. Featuring the original art of celebrated naturalist Roger Tory Peterson; incorporating the Peterson Identification System, the most effective method for bird identification; and using a straightforward design. This series makes field guides accessible and appealing to children. Roger Tory Peterson was the inventor of the modern field guide. For ages 10 and up.