A biography of Roger Tory Peterson, artist, environmentalist, and creator of the Peterson Field Guides for identifying birds. Interest Level: 3-6 Reading Level: 5.9 ATOS Book Level: 6.1 AR Interest Level: LG AR Points: 1 AR Quiz: 147746EN Reading Counts Level: 7.6 Reading Counts Points: 3 Lexile Measure: 1010 Lexile Code: AD (Adult Directed).