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Bull elk (Cervus canadensis), along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

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

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Trumpeter swan in river, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snow covered bison (Bison biso), on the river bank, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Young elk (Cervus canadensis) grazing along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

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

Eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

View over the Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Elk (Cervus canadensis) with tourists along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Fly fisherman casting in the early morning fog in the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Winter in Midway basin, buffalo beside Firehole river, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

View from the Rim, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Buffalo beside Firehole River in winter in Midway geothermal basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

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

Swimming Buffalos in the Yellowstone River, Bos bison; American Buffalo; American Bison; Swimming The Yellowstone River; Yellowstone National Park; Wyoming

Duck For Lunch, Lontra canadensis; River Otter; Otters near the water; Otters with a duck to eat; Yellowstone Otters, Yellowstone River; Yellowstone National Park; Winter; Wyoming;

Adult trumpeter swans (Cygnus buccinator) on the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Adult trumpeter swans (Cygnus buccinator) on the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Pair Of Otters, Lontra canadensis; River Otter; Otters near the water; Yellowstone Otters, Yellowstone River; Yellowstone National Park; Winter; Wyoming;

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Adult trumpeter swans (Cygnus buccinator) taking off and landing on the Yellowstone River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Adult trumpeter swans (Cygnus buccinator) taking off and landing on the Yellowstone River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Adult bull elk (Cervus elaphus) crossing the Madison River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming

Adult male bufflehead (Bucephala albeola) in breeding plumage on the wing over the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

Buffalo (Bison bison) herd crossing the Yellowstone River in Yellowstone National Park, Wyoming, USA.

A family of river otters (Lontra canadensis) foraging in the Yellowstone River in Hayden Valley in Yellowstone National Park, Wyoming, USA

Lower Falls from Lookout Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, Wyoming.

Lower Falls of the Yellowstone River, with rainbow at base of the falls, from Artists Point, Yellowstone National Park, Wyoming.

Lower Falls of the Yellowstone River, with rainbow at base of the falls, from Artists Point, Yellowstone National Park, Wyoming.

Lower Falls, most popular waterfall in Yellowstone, are located in head of the Grand Canyon in Yellowstone River. The yellow rocks gave name of Yellowstone National Park, Wyoming, United States

Waterfall, Lower Falls, Mountain River in a Gorge, Johnston Creek in Johnston Canyon, Bow Valley, Banff National Park, Rocky Mountains, Alberta, Canada, North America

Waterfall, Lower Falls, Mountain River in a Gorge, Johnston Creek in Johnston Canyon, Bow Valley, Banff National Park, Rocky Mountains, Alberta, Canada, North America

Coloured thermophilic bacteria, the outlet of Cliff Geyser, Fire Hole River, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

View over Firehole River, Geyser Hill, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Waterfall, Lower Falls, Mountain River in a Gorge, Johnston Creek in Johnston Canyon, Bow Valley, Banff National Park, Rocky Mountains, Alberta, Canada, North America

Yellowstone River flows through Gorge, Grand Canyon of the Yellowstone, View from North Rim, Brink of the Lower Falls, Yellowstone National Park, Wyoming, USA, North America

Hiker at Red Rock Viewpoint, Lower Falls, Waterfall in a gorge, Grand Canyon of the Yellowstone River, View from North Rim, Yellowstone National Park, Wyoming, USA, North America

Runoff from Excelsior Geyser into Firehole River, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Outlet of the Excelsior Geyser in Firehole River, Midway Geyser Basin, colourful thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Steaming geothermal springs and geysers, Firehole River, Midway Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Runoff from Excelsior Geyser into Firehole River, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, geysers, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Colored thermophilic bacteria, outlet of the Cliff Geyser, Firehole River, Black Sand Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Sheepeater Cliffs, basalt cliffs, also known as Tukuaduka, Gardner River, Yellowstone National Park, Wyoming, United States of America, USA

A fly fisher casting his line out of a boat while fly fishing on the Yellowstone River surrounded by fall colors in Bozeman, Montana.