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Adult horses (Equus ferus caballus), grazing at the foot of the Grand Teton Mountains, Wyoming, United States of America, North America

Adult horses (Equus ferus caballus) grazing at the foot of the Grand Teton Mountains, Wyoming, United States of America, North America

Adult bison (Bison bison) with young grazing in Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An adult pronghorn mother (Antilocapra americana), with newborn calves in Yellowstone National Park, Wyoming, United States of America, North America

Adult horses (Equus ferus caballus) grazing at the foot of the Grand Teton Mountains, Wyoming, United States of America, North America

A pair of young grizzly bears (Ursus arctos), in the shrubs near Grand Teton National Park, Wyoming, United States of America, North America

An adult American red squirrel (Tamiasciurus hudsonicus), in Yellowstone National Park, Wyoming, United States of America, North America

An adult yellow-bellied marmot (Marmota flaviventris), in Yellowstone National Park, Wyoming, United States of America, North America

An adult Uinta chipmunk (Neotamias umbrinus), in Yellowstone National Park, Wyoming, United States of America, North America

Yellowstone waterfall during a snowstorm in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An adult yellow-bellied marmot (Marmota flaviventris), in Yellowstone National Park, Wyoming, United States of America, North America

Moose (Alces alces) cow dribbles after feeding, autumn (fall), Grand Teton National Park, Wyoming, United States of America, North America

Yellowstone thermal features emit steam backlit by sun, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North AmericaWyoming, USA

Alert mule deer (Odocoileus hemionus) stares at the camera, Grand Teton National Park, Wyoming, United States of America, North America

Cinnamon black bear (Ursus americanus) pauses from collecting autumn (fall) berries, Grand Teton National Park, Wyoming, United States of America, North America

Bull moose (Alces alces) amongst autumn (fall) vegetation; Grand Teton National Park, Wyoming, United States of America, North America

Wildfowl in flight over Snake River surrounded by a cold dawn mist in autumn (fall), Grand Teton National Park, Wyoming, United States of America, North America

Steam and turquoise depths at Black Pool, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

American Bison (Bison bison), profile sticking out tongue, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Beaver (Castor canadensis) feeding in Soda Butte Creek, Yellowstone National Park, Wyoming, United States of America, North America

Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Geyser erupting over sinter terrace, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Cathedral Group of Mount Teewinot, Mount Owen and Grand Teton reflected in the Beaver Pond, Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America, North America

The Cathedral Group of Mount Teewinot, Mount Owen and Grand Teton reflected in the Snake River, Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America, North America

Tourists on the boardwalk around the Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bull elk near Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone River in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snowscape with stream and trees in the fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

American bison (Bison Bison) in the snow on a river bank, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful geyser under a starry sky, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Four trumpeter swans (Cygnus buccinator), on the river with reflection, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Great Fountain Geyser at sunset with reflection and sunburst, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mount Moran and the Teton Range from Oxbow Bend, Snake River, Grand Tetons National Park, Wyoming, United States of America, North America

Mount Moran and Teton Range from Oxbow Bend, Snake River at dawn, Grand Tetons National Park, Wyoming, United States of America, North America

Mount Moran and the Teton Range from Oxbow Bend, Snake River, Grand Tetons National Park, Wyoming, United States of America, North America

Coyote (Canis latrans) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Osprey (Pandion haliaetus) along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An adult golden-mantled ground squirrel (Callospermophilus lateralis), feeding in Yellowstone National Park, Wyoming, United States of America, North America

Great grey owl (great grey owl) (Strix nebulosa) female with prey and a 24-day-old chick, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) kit licking its father's mouth, Yellowstone National Park, Wyoming, United States of America, North America

Uinta ground Squirrel (Urocitellus armatus) among mountain bluebell (Mertensia ciliata), Yellowstone National Park, Wyoming, United States of America, North America

Bull Elk (Cervus canadensis) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Bull moose (Alces alces), close up with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

Bighorn Sheep (Ovis canadensis) ram, Yellowstone National Park, Wyoming, United States of America, North America

Vertical of bull moose (Alces alces), in front Grand Teton peak, Grand Teton National Park, Wyoming, United States of America, North America

Sunset and reflection of Teton Range in Snake River at Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America, North America

September 12, 2009 - Plume Geyser eruption, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Castle Geyser eruption with rainbow, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Sawmill Geyser, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Morning Glory Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Chromatic Pool Hot Spring, Upper Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Steam rising over Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 12, 2009 - Grand Prismatic Spring, Midway Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

September 11, 2009 - White Dome Geyser erupting, Lower Geyser Basin geothermal area, Yellowstone Caldera, Yellowstone National Park, Wyoming.

Common raven (Corvus corax), Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) sow and two chocolate cubs of the year or spring cubs, Yellowstone National Park, Wyoming, United States of America, North America

American badger (Taxidea taxus), Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) carrying Uinta ground squirrel (Urocitellus armatus) prey, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) kit posing, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) vixen and kit in the fog, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) vixen nursing her kits, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf running in the rain, Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) yearling cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Juvenile golden eagle (Aquila chrysaetos) in flight over snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

American dipper (water ouzel) (Cinclus mexicanus) standing on ice, Yellowstone National Park, Wyoming, United States of America, North America

Wild horse (Equus Caballus) mare and foal, Green River, Wyoming, United States of America, North America

Pine grosbeak (Pinicola enucleator) on branch, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Canyon of the Yellowstone River from Brink of the Lower Falls, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Artists Point looking towards Lower Falls, Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

American Bison (Bison bison), Little Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Elk (Cervus canadensis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Porcelain Springs, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cache Creek, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snowscape of reflection of sky in thermal feature, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snowscape trees in the fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Moose (Alces alces), Gros Ventre valley, Grand Tetons National Park, Wyoming, United States of America, North America

TA Moulton Barn, Mormon Row, Grand Tetons National Park, Wyoming, United States of America, North America

Beaver dam, Snake River at Schwabacher Landing, Grand Tetons National Park, Wyoming, United States of America, North America

Hairy woodpecker (Leuconotopicus villosus), perched on tree trunk, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Evening eruption of Old Faithful geyser with tree and snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cows in the snow with frost-covered trees in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Red Fox (Vulpes vulpes) (Vulpes fulva) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

American marten (pine marten) (Martes americana) in the snow, Yellowstone National Park, Wyoming, United States of America, North America

Gray wolf (Canis lupus) 870F of the Junction Butte Pack at an elk carcass in the winter, Yellowstone National Park, Wyoming, United States of America, North America