A bighorn sheep ram walks across a snowy field
A bighorn sheep ram bears a battered horn
A bighorn sheep looks out over a rocky cliffside
A bison in spring in Yellowstone National Park
Two bison calves look out over a sagebrush field
A bison displays a "flehmen" response
A bull elk in Yellowstone National Park
A bull moose in Grand Teton National Park
A pronghorn on Antelope Island, Utah
A bull moose near Katmai National Park, Alaska
A bison caught in a surprise spring snowstorm
A bighorn sheep in snowy Yellowstone
A bison braves the icy cold of Yellowstone National Park
A bison with hoarfrost along her face
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