The Reign of Wolf 21: The Saga of Yellowstone's Legendary Druid Pack

RICK MCINTYRE has spent more than 40 years watching wolves in America's national parks, 25 of those years in Yellowstone, where he has accumulated over 100,000 wolf sightings and educated the public about the park's most famous wolves. He has spoken about the Yellowstone wolves with 60 Minutes, NPR, and CBC, and he is profiled extensively in Nate Blakeslee's American Wolf and in international publications. He lives in Silver Gate, Montana.

MARC BEKOFF is professor emeritus of ecology and evolutionary biology at the University of Colorado, Boulder, and co-founder with Jane Goodall of Ethologists for the Ethical Treatment of Animals.