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Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Daniel J. Cox / Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming
Hills in the Lamar Valley, in snow, Yellowstone National Park, Wyoming, USA, February 2013.
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Kirkendall-Spring / Hills in the Lamar Valley, in snow, Yellowstone National Park, Wyoming, USA, February 2013.
American buffalo / Bison (Bison bison) in deep snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, January
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Kirkendall-Spring / American buffalo / Bison (Bison bison) in deep snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, January
Rocky mountain bighorn sheep (Ovis canadensis canadensis) grazing. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
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Nick Garbutt / Rocky mountain bighorn sheep (Ovis canadensis canadensis) grazing. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
Rocky Mountain bighorn sheep (Ovis canadensis canadensis) male grazing. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
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Nick Garbutt / Rocky Mountain bighorn sheep (Ovis canadensis canadensis) male grazing. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
Coyotes (Canis latrans) walking in snow. Lamar River Valley, Yellowstone National Park, Wyoming, USA.
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Nick Garbutt / Coyotes (Canis latrans) walking in snow. Lamar River Valley, Yellowstone National Park, Wyoming, USA.
Bighorn Sheep (Ovis canadensis) ram digging up shrub in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram digging up shrub in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
Coyote (Canis latrans) pack in territorial howl in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Coyote (Canis latrans) pack in territorial howl in winter, Lamar Valley, Yellowstone National Park, Wyoming
Coyote (Canis latrans) pack in territorial howl in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Coyote (Canis latrans) pack in territorial howl in winter, Lamar Valley, Yellowstone National Park, Wyoming
The Lamar River mostly frozen by winters cold in the Lamar Valley of Yellowstone National Park, Wyoming, USA. January 2018.
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Kirkendall-Spring / The Lamar River mostly frozen by winters cold in the Lamar Valley of Yellowstone National Park, Wyoming, USA. January 2018.
American bison (Bison bison) Lamar Valley, Yellowstone National Park, Montana, USA, July.
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Phil Savoie / American bison (Bison bison) Lamar Valley, Yellowstone National Park, Montana, USA, July.
Clark's nutcracker (Nucifraga columbiana) juvenile searching for food in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June.
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Mike Read / Clark's nutcracker (Nucifraga columbiana) juvenile searching for food in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June.
Clark's nutcracker (Nucifraga columbiana) two juveniles searching for food in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June.
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Mike Read / Clark's nutcracker (Nucifraga columbiana) two juveniles searching for food in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June.
American Bison (Bison bison) running in snow, Lamar Valley, Yellowstone National Park, Wyoming
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Benjamin Olson / American Bison (Bison bison) running in snow, Lamar Valley, Yellowstone National Park, Wyoming
American bison (Bison bison) male Lamar Valley. Yellowstone National Park, Wyoming, USA. June
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Nick Garbutt / American bison (Bison bison) male Lamar Valley. Yellowstone National Park, Wyoming, USA. June
RF - Rocky Mountain bighorn sheep (Ovis canadensis canadensis) searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed eith...
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Nick Garbutt / RF - Rocky Mountain bighorn sheep (Ovis canadensis canadensis) searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed eith...
Rocky Mountain Bighorn Sheep (Ovis canadensis canadensis) male searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
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Nick Garbutt / Rocky Mountain Bighorn Sheep (Ovis canadensis canadensis) male searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January
Coyote (Canis latrans) pouncing,  hunting for rodents in snow. Lamar River Valley, Yellowstone National Park, Wyoming, USA.
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Nick Garbutt / Coyote (Canis latrans) pouncing, hunting for rodents in snow. Lamar River Valley, Yellowstone National Park, Wyoming, USA.
Rocky Mountain Bighorn Sheep (Ovis canadensis canadensis) male sparring / fighting Lamar Valley, Yellowstone National Park, Wyoming, USA. January
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Nick Garbutt / Rocky Mountain Bighorn Sheep (Ovis canadensis canadensis) male sparring / fighting Lamar Valley, Yellowstone National Park, Wyoming, USA. January
American bison (Bison bison) running in front of a tourist vehicle on the road through the Lamar Valley. Yellowstone National Park, Wyoming, USA. June
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Nick Garbutt / American bison (Bison bison) running in front of a tourist vehicle on the road through the Lamar Valley. Yellowstone National Park, Wyoming, USA. June
Cottonwood trees (Populus deltoides), Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
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Kirkendall-Spring / Cottonwood trees (Populus deltoides), Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
Cottonwood trees (Populus deltoides)  Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
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Kirkendall-Spring / Cottonwood trees (Populus deltoides) Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
Frosted Cottonwood trees (Populus deltoides) at Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
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Kirkendall-Spring / Frosted Cottonwood trees (Populus deltoides) at Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
Frosted Cottonwood trees (Populus deltoides) at Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
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Kirkendall-Spring / Frosted Cottonwood trees (Populus deltoides) at Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
Winter with Cottonwood trees (Populus deltoides)  Lamar Valley, Yellowstone National Park, Wyoming, USA. Januray 2016.
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Kirkendall-Spring / Winter with Cottonwood trees (Populus deltoides) Lamar Valley, Yellowstone National Park, Wyoming, USA. Januray 2016.
Winter sunrise with reflection on Lamar River, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
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Kirkendall-Spring / Winter sunrise with reflection on Lamar River, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2016.
Monument plant (Frasera speciosa) Lamar Valley, Yellowstone National Park, Wyoming USA June
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Mike Read / Monument plant (Frasera speciosa) Lamar Valley, Yellowstone National Park, Wyoming USA June
Monument plant (Frasera speciosa) Lamar Valley, Yellowstone National Park, Wyoming USA June
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Mike Read / Monument plant (Frasera speciosa) Lamar Valley, Yellowstone National Park, Wyoming USA June
Rocky mountain iris (Iris missouriensis) Lamar Valley, Yellowstone National Park, Wyoming June
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Mike Read / Rocky mountain iris (Iris missouriensis) Lamar Valley, Yellowstone National Park, Wyoming June
Long-plumed purple avens (Geum trifolium) Lamar Valley, Yellowstone National Park, Wyoming USA June
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Mike Read / Long-plumed purple avens (Geum trifolium) Lamar Valley, Yellowstone National Park, Wyoming USA June
Long-plumed purple avens (Geum trifolium) Lamar Valley, Yellowstone National Park, Wyoming USA June
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Mike Read / Long-plumed purple avens (Geum trifolium) Lamar Valley, Yellowstone National Park, Wyoming USA June
Clark's nutcracker (Nucifraga columbiana) juvenile in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June
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Mike Read / Clark's nutcracker (Nucifraga columbiana) juvenile in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June
Clark's nutcracker (Nucifraga columbiana) juvenile in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June
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Mike Read / Clark's nutcracker (Nucifraga columbiana) juvenile in pine tree, Lamar Valley, Yellowstone National Park, Wyoming, USA, June
Cabin in snow on starry night, Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2015.
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Kirkendall-Spring / Cabin in snow on starry night, Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA. February 2015.
Lamar River in snow, Lamar Valley of Yellowstone National Park, Wyoming, USA. February 2015.
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Kirkendall-Spring / Lamar River in snow, Lamar Valley of Yellowstone National Park, Wyoming, USA. February 2015.
Elk skull and antlers (Cervus elaphus) in snow, Lamar Valley, Yellowstone National Park, Wyoming , USA. February 2015.
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Kirkendall-Spring / Elk skull and antlers (Cervus elaphus) in snow, Lamar Valley, Yellowstone National Park, Wyoming , USA. February 2015.
American Bison (Bison bison) herd resting in the snow at sunrise, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / American Bison (Bison bison) herd resting in the snow at sunrise, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
A coyote (Canis latrans) hunting in the snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / A coyote (Canis latrans) hunting in the snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
American Bison (Bison bison) herd march through the Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / American Bison (Bison bison) herd march through the Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
American Bison (Bison bison) covered in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / American Bison (Bison bison) covered in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
Sunrise over the Lamar Valley in winter, Yellowstone National Park, Wyoming, USA. December 2013.
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Floris van Breugel / Sunrise over the Lamar Valley in winter, Yellowstone National Park, Wyoming, USA. December 2013.
A wild Grey Wolf (Canis lupus), dark form, standing in the snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. January.
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Floris van Breugel / A wild Grey Wolf (Canis lupus), dark form, standing in the snow, Lamar Valley, Yellowstone National Park, Wyoming, USA. January.
A Red Fox (Vulpes vulpes) waking up from a nap, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / A Red Fox (Vulpes vulpes) waking up from a nap, Lamar Valley, Yellowstone National Park, Wyoming, USA. December.
A large bull Elk (Cervus canadensis) resting under frosty Cottonwood trees in the Lamar Valley, Yellowstone National Park, Wyoming, USA. Panoramic stitch of 2 images.
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Floris van Breugel / A large bull Elk (Cervus canadensis) resting under frosty Cottonwood trees in the Lamar Valley, Yellowstone National Park, Wyoming, USA. Panoramic stitch of 2 images.
Rose Creek and trees in snow,Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
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Kirkendall-Spring / Rose Creek and trees in snow,Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
Fence line at the Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
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Kirkendall-Spring / Fence line at the Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
Fence with shadows on snow, Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
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Kirkendall-Spring / Fence with shadows on snow, Buffalo Ranch, Lamar Valley, Yellowstone National Park, Wyoming, USA, January 2014.
Sunset in the Lamar Valley of Yellowstone National Park, Wyoming, USA, February 2013.
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Kirkendall-Spring / Sunset in the Lamar Valley of Yellowstone National Park, Wyoming, USA, February 2013.
Elk skull with antlers in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, February 2013.
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Kirkendall-Spring / Elk skull with antlers in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, February 2013.
Elk skull with antlers in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, February 2013.
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Kirkendall-Spring / Elk skull with antlers in snow, Lamar Valley, Yellowstone National Park, Wyoming, USA, February 2013.
Sunset in the Lamar Valley of Yellowstone National Park, Wyoming, USA, June 2013.
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Kirkendall-Spring / Sunset in the Lamar Valley of Yellowstone National Park, Wyoming, USA, June 2013.
Remains of an elk in the Lamar Valley of Yellowstone National Park, Wyoming, USA, June 2013.
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Kirkendall-Spring / Remains of an elk in the Lamar Valley of Yellowstone National Park, Wyoming, USA, June 2013.
Fence line, Buffalo Ranch, Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
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Kirkendall-Spring / Fence line, Buffalo Ranch, Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
Frost covered grass and Ranger Peak, Lamar Valley, Yellowstone National Park. Wyoming, USA January
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Kirkendall-Spring / Frost covered grass and Ranger Peak, Lamar Valley, Yellowstone National Park. Wyoming, USA January
Frost on grass along the Lamar River, Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
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Kirkendall-Spring / Frost on grass along the Lamar River, Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
Frosted grass along the Lamar River in the Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
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Kirkendall-Spring / Frosted grass along the Lamar River in the Lamar Valley of Yellowstone National Park. Wyoming, USA, January 2012
Detail of frosted grass in the Lamar Valley, Yellowstone National Park. Wyoming, USA, January
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Kirkendall-Spring / Detail of frosted grass in the Lamar Valley, Yellowstone National Park. Wyoming, USA, January
Herd of American Bison (Bison bison) in snow along the Lamar River Valley. Yellowstone National Park, Wyoming, USA, February. Digital composite.
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Nick Garbutt / Herd of American Bison (Bison bison) in snow along the Lamar River Valley. Yellowstone National Park, Wyoming, USA, February. Digital composite.
Red Fox (Vulpes vulpes) follows its winter hunting trail through the Lamar Valley in Yellowstone National Park, Wyoming, USA. December.
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Floris van Breugel / Red Fox (Vulpes vulpes) follows its winter hunting trail through the Lamar Valley in Yellowstone National Park, Wyoming, USA. December.
American buffalo / Bison (Bison bison) walking along road to avoid deep snow, Lamar Valley, Yellowstone National Park, Washington, USA, January 2011
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Kirkendall-Spring / American buffalo / Bison (Bison bison) walking along road to avoid deep snow, Lamar Valley, Yellowstone National Park, Washington, USA, January 2011
Rocky Mountain Douglas-fir (Pseudotsuga menziesii). Lamar Valley, Yellowstone National Park, Wyoming, USA, May.
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George Sanker / Rocky Mountain Douglas-fir (Pseudotsuga menziesii). Lamar Valley, Yellowstone National Park, Wyoming, USA, May.
Two Pronghorn antelope (Antilocapra americana) sparring in a open grass and sagebrush area of Lamar Valley. Yellowstone National Park, Wyoming, USA, May
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Diane McAllister / Two Pronghorn antelope (Antilocapra americana) sparring in a open grass and sagebrush area of Lamar Valley. Yellowstone National Park, Wyoming, USA, May
Wolf watchers looking out over Lamar Valley. Yellowstone National Park, Wyoming, USA, September.
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Peter Cairns / Wolf watchers looking out over Lamar Valley. Yellowstone National Park, Wyoming, USA, September.
Hoarfrost on Cottonwood Trees (Populus deltoides), Lamar Valley, Yellowstone NP, Wyoming, USA
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Rob Tilley / Hoarfrost on Cottonwood Trees (Populus deltoides), Lamar Valley, Yellowstone NP, Wyoming, USA
Buffalo / Bison {Bison bison} grazing in Lamar Valley, Yellowstone National Park, Wyoming, USA
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Jeff Vanuga / Buffalo / Bison {Bison bison} grazing in Lamar Valley, Yellowstone National Park, Wyoming, USA
Mini waterfall in Lamar Valley, Yellowstone NP, Wyoming, USA
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David Welling / Mini waterfall in Lamar Valley, Yellowstone NP, Wyoming, USA
Monument plant {Frasera speciosum} Lamar Valley, Yellowstone NP, Wyoming, USA.
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Philippe Clement / Monument plant {Frasera speciosum} Lamar Valley, Yellowstone NP, Wyoming, USA.
American bison, bull + herd {Bison bison} Lamar valley, Yellowstone NP, Wyoming, USA.
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Philippe Clement / American bison, bull + herd {Bison bison} Lamar valley, Yellowstone NP, Wyoming, USA.
Kettle ponds in the Lamar Valley, Yellowstone NP, Wyoming, USA.
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Philippe Clement / Kettle ponds in the Lamar Valley, Yellowstone NP, Wyoming, USA.
Cottonwood trees (Populus deldoides) with early snow  Lamar Valley, Pennsylvannia, USA
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Niall Benvie / Cottonwood trees (Populus deldoides) with early snow Lamar Valley, Pennsylvannia, USA
Cottonwood trees with early snow (Populus deldoides) Pennsylvania, USA.
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Niall Benvie / Cottonwood trees with early snow (Populus deldoides) Pennsylvania, USA.
View north from Mount Washburn, Lamar valley, Yellowstone, Wyoming, USA
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David Kjaer / View north from Mount Washburn, Lamar valley, Yellowstone, Wyoming, USA
Shed antlers of Elk {Cervus elaphus} in Lamar valley, Yellowstone, USA
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Philippe Clement / Shed antlers of Elk {Cervus elaphus} in Lamar valley, Yellowstone, USA
Gray Wolf (Canis lupus) member of the Druid Pack, feeding on elk carcass in Lamar Canyon, Yellowstone National Park, Wyoming
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Sumio Harada / Gray Wolf (Canis lupus) member of the Druid Pack, feeding on elk carcass in Lamar Canyon, Yellowstone National Park, Wyoming
Gray Wolf (Canis lupus) member of the Druid Pack and Coyote (Canis latrans) pause while feeding on elk carcass, Lamar Valley, Yellowstone National Park, Wyoming
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Sumio Harada / Gray Wolf (Canis lupus) member of the Druid Pack and Coyote (Canis latrans) pause while feeding on elk carcass, Lamar Valley, Yellowstone National Park, Wyoming
American Bison (Bison bison) trio in valley, Lamar River, Lamar Valley, Yellowstone National Park, Wyoming
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Chase Dekker / American Bison (Bison bison) trio in valley, Lamar River, Lamar Valley, Yellowstone National Park, Wyoming
American Bison (Bison bison) herd crossing river, Lamar River, Lamar Valley, Yellowstone National Park, Wyoming
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Chase Dekker / American Bison (Bison bison) herd crossing river, Lamar River, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) rams fighting in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) rams in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) rams in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) rams browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) rams browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Bighorn Sheep (Ovis canadensis) ram browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
Coyote (Canis latrans) pack in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Coyote (Canis latrans) pack in winter, Lamar Valley, Yellowstone National Park, Wyoming
Coyote (Canis latrans) pair in dominance display in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Coyote (Canis latrans) pair in dominance display in winter, Lamar Valley, Yellowstone National Park, Wyoming
Moose (Alces alces shirasi) bull browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Moose (Alces alces shirasi) bull browsing in winter, Lamar Valley, Yellowstone National Park, Wyoming
River in grassland, Lamar Valley, Yellowstone National Park, Wyoming
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Daniel J. Cox / River in grassland, Lamar Valley, Yellowstone National Park, Wyoming
American Bison (Bison bison) pair in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Benjamin Olson / American Bison (Bison bison) pair in winter, Lamar Valley, Yellowstone National Park, Wyoming
American Bison (Bison bison) in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Benjamin Olson / American Bison (Bison bison) in winter, Lamar Valley, Yellowstone National Park, Wyoming
American Bison (Bison bison) cow with two calves running, Lamar Valley, Yellowstone National Park, Wyoming
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Duncan Usher / American Bison (Bison bison) cow with two calves running, Lamar Valley, Yellowstone National Park, Wyoming