A librarian named Mavis McGrew introduces the animals in the zoo to the joy of reading when she drives her bookmobile to the zoo by mistake. Interest Level: K-3 Reading Level: 4.1 ATOS Book Level: 4.1 AR Interest Level: LG AR Points: .5 AR Quiz: 82035EN Reading Counts Level: 2.5 Reading Counts Points: 1 Lexile Code: NP (Non-Prose).