Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull in snow, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull feeding on Douglas Fir (Pseudotsuga menziesii), western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bulls sparring in winter, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull amid bushes, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull resting in snow, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull crossing river, North America
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull and tourists along road, Jasper National Park, Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull in velvet grazing on grass, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull in velvet, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull and cows in winter, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull kicking snow, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling with harem, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling with cow nearby, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull flehming, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull and cow mating, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull in velvet with Canadian Rockies backdrop, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull running, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull and cows, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bulls fighting, western Alberta, Canada
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull bugling, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) rubs from bull on spruce tree, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) rubs from bull on spruce tree, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull flehming, western Montana
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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull at forest edge, western Montana
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Yva Momatiuk & John Eastcott / American Elk (Cervus elaphus nelsoni) bull near tourists, Yellowstone National Park, Wyoming
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Suzi Eszterhas / Elk {Cervus elaphus} bull resting with Blackbirds on its back, Yellowstone NP, Montana, USA
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Rolf Nussbaumer / Elk / Wapiti {Cervus elaphus} bull in velvet on alpine tundra, Rocky Mountain National Park, Colorado, USA, June 2007
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Konrad Wothe / Elk (Cervus elaphus) bulls fighting, Yellowstone National Park, Wyoming
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Konrad Wothe / Elk (Cervus elaphus) bulls fighting in the snow, Yellowstone National Park, Wyoming
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Rolf Nussbaumer / Elk / Wapiti {Cervus canadensis} bull bugling amongst aspen trees, Rocky Mountain National Park, Colorado, USA, September 2006
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Rolf Nussbaumer / Elk / Wapiti {Cervus canadensis} bull spray marking his territory with urine, Rocky Mountain National Park, Colorado, USA, September 2006
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Suzi Eszterhas / Elk (Cervus elaphus) bull in velvet, wading in the Firehole River, Yellowstone National Park, Montana
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Jeff Vanuga / Bull elk {Cervus elaphus} crossing the Madison River, Yellowstone National Park, Wyoming.
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Jeff Vanuga / Bull elk {Cervus elaphus} Yellowstone National Park, Yellowstone, Wyoming, USA
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George McCarthy / Bull Elk (Cervus canadensis) roaring during Autumn rut in Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) in rutting season, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) with antlers in rutting season, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) in rutting season, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) roaring during rut, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk {Cervus canadensis} roaring, Yellowstone NP, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) at dawn, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) crossing Madison River at dawn, Yellowstone National Park, Montana, USA
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George McCarthy / Bull Elk (Cervus canadensis) crossing Madison River, Yellowstone National Park, Montana, USA
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Patricio Robles Gil / Elk (Cervus elaphus) male pair bedded down in tall grass, Banff National Park, Canada
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Mark Raycroft / Elk (Cervus elaphus) large bull standing beside river
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Mark Raycroft / Elk (Cervus elaphus) large bull drinking from stream
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Mark Raycroft / Elk (Cervus elaphus) large bull bugling
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Mark Raycroft / Elk (Cervus elaphus) large bull crossing a river
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Mark Raycroft / Elk (Cervus elaphus) large bull crossing road amid traffic
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Mark Raycroft / Elk (Cervus elaphus) large bull North America
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Mark Raycroft / Elk (Cervus elaphus) large bull laying on a lawn in the suburbs
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Larry Michael / Male Elk {Cervus elaphus} beside river, Wyoming, USA
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Larry Michael / Male Elk {Cervus elaphus} in snow storm, Wyoming, USA
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Rolf Nussbaumer / RF- Elk (Cervus elaphus) bull in rut crossing river while calling / bugling. Yellowstone National Park, Wyoming, USA. (This image may be licensed either as rights managed or royalty free.)
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Rolf Nussbaumer / Elk {Cervus elaphus} bull in rut calling / bugling, Yellowstone NP, Wyoming, USA
Staffan Widstrand / RF- Moose bull grazing (Alces alces) head pportrait. Sarek National Park, Sweden. (This image may be licensed either as rights managed or royalty free.)
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Sumio Harada / Elk (Cervus elaphus) bull backlit by morning light, Rocky Mountains, North America
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Mark Raycroft / Elk (Cervus elaphus) bull bugling
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Jeff Vanuga / Female Elk crosses Gibon River at dawn, bull watches, Yellowstone NP, Wyoming, USA.
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Jeff Vanuga / Bull Elk {Cervus elaphus} bugling during autumn rut. Yellowstone NP, Wyoming, USA.
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Jeff Vanuga / Bull Elk {Cervus elaphus} fighting during autumn rut. Yellowstone NP, Wyoming, USA.
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Jeff Vanuga / Bull Elk {Cervus elaphus} fighting during autumn rut. Yellowstone NP, Wyoming, USA.
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Mark Raycroft / Elk (Cervus elaphus) large bull crossing road in front of semi truck
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Mark Raycroft / Elk (Cervus elaphus) side view of large male bugling
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Mark Raycroft / Elk (Cervus elaphus) alert bull in meadow at forest's edge
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Mark Raycroft / Elk (Cervus elaphus) large bull in mountain meadow
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Mark Raycroft / Elk (Cervus elaphus) alert bull in meadow at forest's edge
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Mark Raycroft / Elk (Cervus elaphus) large bull standing alert in meadow with mountains behind
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Mark Raycroft / Elk (Cervus elaphus) large bull bugling near cow
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Mark Raycroft / Elk (Cervus elaphus) bull bugling
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Mark Raycroft / Elk (Cervus elaphus) large bull bugling in forest clearing
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Mark Raycroft / Elk (Cervus elaphus) large bull and harem of cows crossing railroad tracks in the mountains
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Michael Quinton / Elk (Cervus elaphus) pair of bulls fighting in smoke from Yellowstone forest fire, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / Tule Elk (Cervus elaphus nannodes) yearling bull in fog, Point Reyes National Seashore, California