Amba, a Siberian tiger cub, is separated from his mother by a forest fire in the Siberian wilderness. Interest Level: K-3 Reading Level: 3.0 ATOS Book Level: 3.1 AR Interest Level: LG AR Points: .5 AR Quiz: 153531EN Lexile Measure: 890 Lexile Code: AD (Adult Directed) Fountas & Pinnell: O.