Journey through harsh cold and rugged mountain ranges to see how wolverines take down prey, raise their young, and live in one of the world's harshest environments. Learn about how their bodies adapt for survival, and about the animal's challenges in a warming world. National Geographic Readers' combination of expert-vetted text, along with brilliant images and a fun approach to reading has proved to be a winning formula with kids, parents and educators. Level 3 text provides accessible, yet wide-ranging, information for fluent readers. Each reader includes text written by an experienced, skilled children's books author, a photo glossary, and interactive features in which kids get to reinforce what they've learned in the book.