To better understand the inner workings of our bodies and to trace the origins of many of today's most common diseases, we have to turn to unexpected sources: worms, flies, and even fish.

Yellowstone National Park was once home to an abundance of wild wolves - but park rangers killed the last of their kind in the 1920s. Decades later, the rangers brought them back, with the first wolves arriving from Canada in 1995. This is the incredible true story of one of those wolves.

With a shrinking wilderness and global warming, the future of the wolverine is uncertain. The Wolverine Way reveals the natural history of this species and the forces that threaten its future, engagingly told by Douglas Chadwick, who volunteered with the Glacier Wolverine Project. This five-year study in Glacier National Park—which involved dealing with blizzards, grizzlies, sheer mountain walls, and other daily challenges to survival—uncovered key missing information about the wolverine's habitat, social structure, and reproduction habits.

Author Kevin Grange—former paramedic and park ranger at Yellowstone and Grand Teton—comes face-to-face with North America’s most fearsome predator, Ursus Arctos. His quest takes him from his home in the Tetons to an eerie, mist-shrouded island of gigantic bruins; from the Bear Center at Washington State University—where scientists believe the secrets of hibernation might help treat diabetes, heart disease, and obesity in humans—to the dark underbelly of for-profit wildlife parks, illegal animal trade and black markets hawking bear bile.

As Charles Darwin suggested more than a century ago, the differences between animals and humans are of degree and not of kind. Not long ago, ethologists denied that animals had emotions or true intelligence. Now, we know that rats laugh when tickled, magpies mourn as they cover the departed with greenery, female whales travel thousands of miles for annual reunions with their gal pals, seals navigate by the stars, bears hum when happy, and crows slide down snowy rooftops for fun.