The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fic

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! The Ice Age is very cool…for t

"Describes the animals of the Quaternary Period, when an ice age took hold of Earth, and new animals evolved to survive the harsh weather. This period also mark

Seven inch fangs made sabertooth cats a formidable ice age animal. Awesome illustrations accompany carefully leveled text about food, habitat, life cycle, and e

The consummate guide to the ultimate sabertooth. Few animals spark the imagination as much as the sabertooth cat Smilodon. With their incredibly long canines, w