Describes the growth and development of a polar bear, from the time it is a cub until it is old enough to take care of itself, in a book that provides information about the physical characteristics, behavior, and habitat of polar bears. Caroline Arnold's Animals Series Interest Level: K-3 Reading Level: 3.3 ATOS Book Level: 3.6 AR Interest Level: LG AR Points: .5 AR Quiz: 134292EN Lexile Measure: 650 Guided Reading Level: M.