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 fiction has never looked better.  Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree House #7: Sunset of the Sabertooth, they had lots of questions. What was it like to live in the Ice Age? How did early humans...

Introduces the period approximately 20,000 years ago when global temperatures were much colder and ice covered much of the planet, and describes how animals living during that time adapted to the environment.

"This book will introduce readers to the American Mastodon and help them learn when and where the animal lived, what it looked like, how it survived, and why it went extinct. Title is complete with glossary, index, and more exciting facts!"--

"This book will introduce readers to the giant short-faced bear and help them learn when and where the animal lived, what it looked like, how it survived, and why it went extinct. Title is complete with glossary, index, and more exciting facts!"--

"This book will introduce readers to the saber-toothed tiger and help them learn when and where the animal lived, what it looked like, how it survived, and why it went extinct. Title is complete with glossary, index, and more exciting facts!"--