Wyoming images - Joel Sartore

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A male elk standing in snowy field near gentle rolling hills near Jackson Hole, Wyoming.

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A rancher rounds up sheep on a Wyoming farm.

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A herd of pronghorns graze near gas drilling rigs sunset near Pinedale, Wyoming.

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Greater sage grouse displaying near Pinedale, Wyoming. This area is being developed for natural gas drilling.

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For the first time in decades, wolves again chase elk through the Lamar Valley of Yellowstone. The reintroduction of wolves has been a great success, drawing a new generation of visitors to the park.

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A male sage grouse splays tail feathers to attract a mate.

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A woman looks out a tour bus window at Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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Uinta ground squirrel near Grand Teton National Park, Wyoming.

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A photographer at Yellowstone National Park, Wyoming.

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A scene from Yellowstone National Park, Wyoming.

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Cheyenne Mountain Zoo is home to the world’s most prolific captive reticulated giraffe herd with 197 births at the Zoo since 1954, when giraffes were introduced to the Zoo’s animal collection. Cheyenne Mountain Zoo currently has 21 reticulated giraffe (Giraffa camelopardalis reticulata) in the herd, making it the largest captive giraffe herd in North America.

A wire fence keeps elk (Cervus canadensis) on Elk National refuge land and from roaming into the town of Jackson, Wyoming.

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A wire fence keeps elk (Cervus canadensis) on Elk National refuge land and from roaming into the town of Jackson, Wyoming.

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A lamb leaps up after being relieved of his tail for better sanitation purposes by Bureau of Land Management workers on federal grazing lands in southern Wyoming.

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Aerials of the Jonah Field in the Green River Basin, Wyoming. A once-wild area that’s now an industrial zone due to natural gas drilling. Sage grouse, mule deer and pronghorn antelope habitat has mostly been ruined here, with no end in sight as the drilling increases across the Pinedale Anticline, the large mesa that caps the gas deposits.