Bison crossing the Little Missouri River in Theodore Roosevelt National Park, North Dakota, USA

Pine Marten in Glacier National Park, Montana, USA

Bighorn sheep ram in early winter in Glacier National Park, Montana, USA

Bighorn sheep ram on Altyn Ridge in Glacier National Park, Montana, USA

Bighorn Sheep scratching his chin on stone wall In Glacier National Park, Montana, USA

Bighorn sheep ram in aspen grove in winter in the Gallatin National Forest, Montana, USA

Bighorn ewes with lambs silhoutted against sunset sky in Badlands National Park, South Dakota, USA

Desert bighorn sheep in Zion National Park, Utah, USA

Fiesty young bison bull at the Tallgrass Prairie Preserve near Pawhuska Oklahoma

Portrait of a wet Bison bull in Theodore Roosevelt National Park in North Dakota

Bison herd in the Lamar Valley of Yellowstone National Park in Wyoming

Bison bull foraging in deep snow in Yellowstone National Park, Wyoming, USA

Bison bull in the North Unit of Theodore Roosevelt National Park, North Dakota, USA

Bison mother with newborn calf at the National Bison Range in Moiese, Montana, USA

Bison bulls grazing at the National Bison Range in Moiese, Montana, USA

Bison bulls grazing in balsomroot with dramatic Mission Mountains at the National Bison Range in Moiese, Montana, USA

Bison bull silhouetted against a brilliant sunset in Theodore Roosevelt National Park, North Dakota, USA

Bison bull at the National Bison Range in Moiese, Montana, USA

Bison Crossing the Little Missouri River at sunrise in Theodore Roosevelt National Park, North Dakota, USA

Bison Crossing the Little Missouri River at sunrise in Theodore Roosevelt National Park, North Dakota, USA

Bison crossing the Little Missouri River in Theodore Roosevelt National Park, North Dakota, USA

Bison herd crosses the Little Missouri River in Theodore Roosevelt National Park, North Dakota, USA

Rainbow over the Blackfeet Nation Bison herd near Browning, Montana, USA

Rainbow over the Blackfeet Nation Bison herd near Browning, Montana, USA

Bull moose feeds in evening light in Grand Teton National Park, Wyoming, USA

Moose mother and calf in Glacier National Park, Montana, USA

Bull moose feeding in backcountry lake in Glacier National Park, Montana, USA

Bull Moose with autumn colors in Glacier National Park, Montana, USA

Bull Moose foraging in Grand Teton National Park, Wyoming, USA

Billy Mountain Goats on Altyn Ridge in Glacier National Park, Montana, USA

Billy Mountain Goat on Altyn Ridge in Glacier National Park, Montana, USA

Mature Billy Mountain Goat with winter coat in Glacier National Park, Montana, USA

Billy mountain goats in winter coat in Glacier National Park, Montana, USA

A pika in gathering forage in a rockpile at Logan Pass in Glacier National Park, Montana, USA

A pika in rockpile at Logan Pass in Glacier National Park, Montana, USA

Prairie dog family sounds the alert at Theodore roosevelt National Park in North Dakota

Closeup look at a painted turtle in the Mission Valley of Montana

Raccoon in a tree in Whitefish Montana

Red Fox Puppy in the Mission Valley, Montana, USA

Red fox puppies at den site near Conrad, Montana, USA

Red Fox Puppies in the Mission Valley, Montana, USA

Red fox pups at den site in Mission Valley, Montana, USA

Bull elk in velvet at The National Bison Range in Moiese, Montana, USA

Bull elk silhouetted aginst the sunrise in Theodore Roosevelt National Park, North Dakota, USA

Bull elk on ridge at last light in Yellowstone National Park, Wyoming, USA

Mature Bull Elk silhoutted against the sunrise at Fort Niobrara NWR in Nebraska

Elk bugling in meadow in Waterton Lakes National Park, Alberta, Canada

Whitetail deer fawn jumping by Mission Creek at the National Bison Range in Montana

Prime whitetail deer buck at the National Bison Range in Montana

Whitetail deer in wheat field near Glasgow, Montana, USA

Whitetail deer fawn in Whitefish, Montana, USA

Mule deer doe with newborn fawn in Theodore Roosevelt National Park, North Dakota, USA

Mule deer fawn hiding in tall grasses near Dupuyer, Montana, USA

Mule deer bucks in velvet antlers with Highwood Mountains in background near Coffee Creek, Montana, USA

Key Deer on No Name Key in Florida, USA

Red Deer Stag with females during rut in Klillarney National Park, Ireland

Coyote catching a trout in the Madison River in winter in Yellowstone National Park, Wyoming, USA

Coyote in winter in Yellowstone National Park, Wyoming, USA

Coyote in winter in Yellowstone National Park

Adult Grizzly Bear in Glacier National Park, Montana USA

Grizzly bear along Going to the Sun Road in Glacier National Park, Montana, USA

Grizzly bear feeding on berries in autumn in Glacier National Park, Montana, USA

Grizzly bear sow in Grand Teton National Park, Wyoming, USA

Grizzly bear at the Grizzly and Wolf Discovery Center in West Yellowstone, Montana, USA captive setting

Black bear feeding on berries in Glacier National Park, Montana, USA

Black bear paw print on my garage door in Whitefish, Montana, USA

at Theodore Rooosevelt National Park, North Dakota, USA

Mare with newborn foal in the Bighorn National Recreation Area, Montana, USA

Wild Horse running at Theodore Rooosevelt National Park, North Dakota, USA

Wild horse in Theodore Roosevelt National Park, North Dakota, USA

Wild horses in Theodore Roosevelt National Park, North Dakota, USA

Stalllion Wild horses in Theodore Roosevelt National Park, North Dakota, USA

Pronghorn antelope at The National Bison Range in Moiese, Montana, USA

Hawaiian Green Sea Turtles on Poipu Beach in Kauai, Hawaii, USA

Bumble bee pollinates milkweed flowers at Makoshika State Park in Glendive, Montana, USA

Elephant seal rookery near San Simeon in Big Sur, California, USA

Canyon tree fogs mating in small pool in Zion National Park, Utah, USA

River Otter with freshly caught fish at Cape Disappointment State Park, Washington, USA