Text and illustrations introduce hippopotamuses, exploring their physical characteristics, noises, behaviors, and habitat. Interest Level: K-3 Reading Level: 3.4 ATOS Book Level: 4.5 AR Interest Level: LG AR Points: .5 AR Quiz: 174010EN Reading Counts Level: 5.9 Reading Counts Points: 1 Lexile Measure: 1050 Guided Reading Level: M Fountas & Pinnell: M.