A grizzly bear cub (Ursus arctos horribilis) stands with arms outstretched.
British Columbia, Canada.
TOM MURPHY/National Geographic Creative
A wolf pup (captive) sits up and howls (Canis species).
A frost-covered herd of American bison (Bison bison) brave the freezing winter weather.
Yellowstone National Park.
An American bison (Bison bison) covered in ice rests on the ground.
Yellowstone National Park, Wyoming.
A trio of captive wolf pups stand behind a fallen tree trunk.
A frost-covered American bison bull (Bison bison) walks through the snow.
Prints in the snow mark the scene where a hawk had caught a meadow vole.
Lamar Valley, Wyoming.
A close view of the head of a raven, Corvus species.
United States of America.
A pair of bull elk fight using their antlers.
A juvenile harp seal (Pagophilus groenlandicus) has an innocent expressionon its face as it lays on the ice.
Gulf of St. Lawrence, Canada.
Portrait of an arctic ground squirrel with dirt on its nose.
Aleutian Islands, Alaska.
A mule deer fawn peeks through branches of an evergreen tree.
Frost covers the coat of an American bison on a chilly morning.
Yellowstone National Park, Montana.
Twilight view of Colonnade falls and surrounding evergreen forests.
Colonnade Falls, Yellowstone National Park, Wyoming.
A bighorn sheep ram, Ovis canadensis, rests in an alpine meadow.
Glacier National Park, Montana.
An American bald eagle in flight.
A group of American bison rest near the Old Faithful geyser.
Old Faithful Geyser, Yellowstone National Park, Wyoming.
Snow "pillows' form an abstract scene.
Soda Butte Creek, Wyoming.
A close view of the face of a grizzly bear.
Grand Prismatic Spring, one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park.
Diamond dust ice crystals cover a stand of Lodgepole pine trees (Pinus contorta) in winter.
An American bald eagle, Haliaeetus leucocephalus, in flight.
The Yellowstone River tumbles 308 feet at Lower Falls.
An up close portrait of a lion.
A scenic view of the Yellowstone River with Absaroka range backdrop.
Yellowstone River, Montana.
A coyote (Canis latrans) curled up on the ground.
Grand Prismatic Spring, one of the largest and most beautiful hydrothermal features.
American bison (Bison bison) graze on a football field near the mountains.
Park County, Montana.
A mountain lion (captive) peeks out of a cave opening.
Sonora Desert Museum, Arizona.
A gorilla baby climbing bamboo.
Two bull elk (Cervus elephus) lock antlers in confrontation.
Adelie penguins lined up on an iceberg.
A close view of a black-chinned sparrow's feathers. (Spizella atrogularis)
The head and shoulders of a great gray owl, Strix nebulosa.
A raven (Corvus corax) eats a mouthful of snow.
Water pours from the antlers of a bull moose lifting his head from Beaverdam Creek.
Beaverdam Creek, Yellowstone National Park, Wyoming.
A bison stands on the edge of bubbling Crested Pool, next to Castle Geyser.
A howling coyote (Canis latrans) atop a snow-covered hill.
A captive snow leopard (Panthera uncia) looks intensely at a subject.
San Diego Zoo, California.
A bison bull soaks up the winter sun close to the sunny south side of the Soda Butte Cone.
A female bison (Bison bison) stands patiently as her young calf plays withher horns.
A polar bear cub (Ursus maritimus) rests on its mother's shoulder.
Hudson Bay, Manitoba, Canada.
Portrait of an African lion cub.
Masai Mara National Park, Kenya.
Aerial view of the colorful Grand Prismatic Spring.
Yellowstone National Park, Wyoming, United States.
Silhouetted trees along the Yellowstone River at sunrise.
Hayden Valley, Yellowstone National Park, Wyoming.
Frosty cottonwood trees standing near a steamy creek in snowy scene.
An aerial view of Excelsior Geyser.
The moon on the horizon of a hillside covered with lodgepole pine trees (Pinus contorta).
A close view of foliage and twisted stem with glistening drops of dew.
A close view of an American bald eagle.
Scenic twilight view of the Yellowstone River and Paradise Valley.
Paradise Valley, Montana.
Grand Prismatic Spring, one of the largest hydrothermal features in Yellowstone National Park.
View of an ice-encrusted American bison (Bison bison).
An elk cow and her newborn calf cross the Gardner River.
A close view of the back and wing of a raven.
Portrait of a female buffalo or bison with frozen snow on its coat.
A coyote (Canis latrans) howls while out on the snow-covered terrain.
A group of bighorn sheep rams.
A pair of captive pine martins (Martes martes) stand on a tree branch.
A New Zealand fur seal (Arctocephalus forsteri) looks confused.
South Island, New Zealand.
A captive mountain lion cub (Felis concolor) takes a walk.
Aerial view of the two main hot springs of Black Sand Basin, Rainbow and Sunset Springs.
A close view of the face of a bighorn sheep ram.
Firemen fight a blazing propane gas fire.
A common raven (Corvus corax) calls out while perched on a branch.
Silhouetted by the sun, a fly fisherman casts his line into the lake.
Yellowstone Lake, Wyoming.
A coyote, Canis latrans, with snow and frost on it's coat, in snow.
Snow dusted American bison forage near a steaming geyser.
A ferruginous hawk, Buteo regalis.
Reflections in Glenn Creek.
An arctic fox, in its white winter coat, curled in the snow.
A red fox jumps in the snow looking for food.
A black bear cub sits on a snow covered tree branch looking around.
Two king penguins embrace.
South Georgia Island.
A black bear sits on a tree branch looking around.
A wolf tries to keep ravens from its wapiti kill.
Two grizzly bears (Ursus arctos horribilis) have a playful fight.
A coyote, looking for food, examines an elk skull.
Lamar Valley, Yellowstone National Park, Wyoming.
Pronghorn antelope on a snowy slope.
Cottontail rabbit in snow.
A bison cow stands in the distance early morning fog and steam from Old Faithful geyser.
A pair of king penguins necking and courting.
Chin strap penguins congregate on a snow-covered shoreline.
A great gray owl (Strix nebulosa) perches on a snow-covered tree.
Adelie penguins lined up to jump from an iceberg into chilly waters.
A brown bear sow with her cubs on a rocky shore.
Katmai National Park, Alaska.
Rock formations patterened by erosion and sedimentary layers.
Coyote Buttes, Paria Canyon-Vermilion Cliffs Wilderness Area, Arizona.
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