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North America - Greater Yellowstone Ecosystem (137) More files...
Created in 1872, Yellowstone was the very first national park in the world. It is the centerpiece of the 20 million acre Greater Yellowstone Ecosystem, a region that includes Grand Teton National Park and adjacent National Forests. Considered to be the world's largest intact ecosystem in the northern temperate zone, Yellowstone is well-known for its wildlife and is the most popular megafauna location in the Continental United States, occupied by grizzly bears, wolves, bison and elk. It is located primarily in Wyoming but extends into Montana and Idaho.

Yellowstone has many types of ecosystems, including subalpine forest, mountain ranges, canyons, lakes and rivers. The topography has been shaped by lava flows and volcanic rocks from the still-active Yellowstone Caldera, the largest sup
Colourful run off from geothermal pool formed by algae and bacteria, Yellowstone National Park, Montana, USA
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George McCarthy / Colourful run off from geothermal pool formed by algae and bacteria, Yellowstone National Park, Montana, USA
Cistern Spring in Norris Geyser Basin showing colour of blue green algae and bacteria. Yellowstone National Park, Wyoming, USA, January 2011.
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Jeff Vanuga / Cistern Spring in Norris Geyser Basin showing colour of blue green algae and bacteria. Yellowstone National Park, Wyoming, USA, January 2011.
Native American Teepee rings on Table Mountain near Dubois, Shoshone reserve, Wyoming, USA, May 2009
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Jeff Vanuga / Native American Teepee rings on Table Mountain near Dubois, Shoshone reserve, Wyoming, USA, May 2009
RF- Elk / Red deer (Cervus elaphus) female in mist at dawn. Yellowstone National Park, Wyoming, USA. (This image may be licensed either as rights managed or royalty free.)
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Peter Cairns / RF- Elk / Red deer (Cervus elaphus) female in mist at dawn. Yellowstone National Park, Wyoming, USA. (This image may be licensed either as rights managed or royalty free.)
Two male Elk {Cervus canadensis} in velvet, resting in foggy meadow at dawn, Yellowstone National Park, Wyoming, USA, July
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Jeff Vanuga / Two male Elk {Cervus canadensis} in velvet, resting in foggy meadow at dawn, Yellowstone National Park, Wyoming, USA, July
Elk {Cervus elaphus} male bugling in fog, Yellowstone NP, Wyoming, USA
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Shattil & Rozinski / Elk {Cervus elaphus} male bugling in fog, Yellowstone NP, Wyoming, USA
Bison {Bison bison} bull warming-up next to thermal pool during winter, Yellowstone National Park, USA
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Jeff Vanuga / Bison {Bison bison} bull warming-up next to thermal pool during winter, Yellowstone National Park, USA
Snowmobiling in the Bridger - Teton National Forest on Togwotee Pass near Dubois, Wyoming. Model released, January 2009
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Jeff Vanuga / Snowmobiling in the Bridger - Teton National Forest on Togwotee Pass near Dubois, Wyoming. Model released, January 2009
Snowmobile road in winter. Yellowstone NP, Wyoming, USA
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Pete Cairns / Snowmobile road in winter. Yellowstone NP, Wyoming, USA
Fisherman fishing at sunrise in the Upper Madison River, Yellowstone NP, Wyoming, USA, September 2006
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Nick Garbutt / Fisherman fishing at sunrise in the Upper Madison River, Yellowstone NP, Wyoming, USA, September 2006
Least chipmunk {Eutamias minimus} on head of photographer Mark Hamblin in Yellowstone NP, WY, USA Model released.
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Pete Cairns / Least chipmunk {Eutamias minimus} on head of photographer Mark Hamblin in Yellowstone NP, WY, USA Model released.
First light on mountains of the Teton range with storm clouds above and Snake river in the foreground, Grand Teton National Park, Wyoming, USA
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Jack Dykinga / First light on mountains of the Teton range with storm clouds above and Snake river in the foreground, Grand Teton National Park, Wyoming, USA