Book excerpt: A dazzling photographic and scientific portrait of how wolves are changing the very nature of Yellowstone. Highly acclaimed for its accuracy and photography of wild wolves. “The book is breathtaking! For anyone who has traveled to Yellowstone in recent years and seen the wolves, this book is must reading.” —National Wildlife Federation “Outstanding and very accurate. (Halfpenny) puts all the scientific research into common language. He fills in with personal observations. The stories really personalize what happened.” —Ed Bangs, Wolf Recovery Coordinator, U.S. Fish & Wildlife Service