Phil Savoie / View of a freshwater lake, Beaverhead National Forest, Montana, July 2011.

Phil Savoie / Muskrat (Ondatra zibethicus) swimming, Gallatin National Forest, Bozeman, Montana, USA, May.

Jeff Vanuga / Grizzly bear (Ursus arctos horribilis) emerging from den after hibernation. Grand Teton National Park, Wyoming, USA. April.

Michael Quinton / Pelican Creek, Pelican Valley is the nucleus of Grizzly Bear habitat in more than 5,000 square miles of the Greater Yellowstone ecosystem, Yellowstone National Park, Wyoming

Phil Savoie / Rainclouds over Madison Valley, Beaverhead National Forest, Greater Yellowstone Ecosystem, Madision Mountains, Montana USA, July