 Old Faithful geyser erupting with elk resting at base; Yellowstone National Park, Wyoming.
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 Snow and ice-covered pine trees along trail at West Thumb Geyser Basin, Yellowstone National Park.
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 Bald Eagle on nest along Madison River; Yellowstone National Park, Wyoming.
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 Julianne Baker of Yellowstone Association Institute telling winter visitors about geothermal activity in the Upper Geyser area of Yellowstone National Park.
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 Bison in winter at Mammoth Terraces, Mammoth Hot Springs; Yellowstone National Park, Wyoming.
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 Giantess Geyser in the Upper Geyser Basin near Old Faithful, with winter visitors on trail; Yellowstone National Park, Wyoming.
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 Geothermal hot spring on the snow-covered banks of the Firehole River at Upper Geyser Basin near Old Faithful; Yellowstone National Park.
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 Winter visitors and Bombardier snow coach with Bison on the road; Yellowstone National Park, Wyoming.
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 Cross-country skier watching eruption at Lone Star Geyser; Yellowstone National Park.
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 Cross-country skier at meadow on Lone Star Geyser Trail; Yellowstone National Park, Wyoming.
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 Old Faithful Snow Lodge in winter, with snow coach and skis at entrance; Yellowstone National Park, Wyoming.
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 Old Faithful geyser steam clouds on clear winter day; Yellowstone National Park, Wyoming.
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 Old Faithful Snow Lodge in winter, dining room exterior at dusk; Yellowstone National Park, Wyoming.
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 Castle Geyser steam at winter dawn; Upper Geyser Basin, Yellowstone National Park, Wyoming.
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 Geothermal hot spring along trail at West Thumb Geyser Basin; Yellowstone National Park.
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 Field of mounded snow along Lone Star Geyser Trail; Yellowstone National Park.
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 Geothermal hot spring surrounded by snow along trail at West Thumb Geyser Basin; Yellowstone National Park.
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 Yellowstone Expeditions' winter cross-country ski camp near Canyon Village; Yellowstone National Park, Wyoming.
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 Car driving on Hwy 212 through Lamar Valley on an early winter morning; Yellowstone National Park.
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 Visitor with spotting scope watching mountain lion and wolves in Lamar Valley during winter; Yellowstone National Park.
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 Ice-covered Aspen tree in winter; Lamar Valley,
Yellowstone National Park, Wyoming.
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 Ice-covered Cottonwood Trees in winter at Lamar Valley, Yellowstone National Park, Wyoming.
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 Bison in snow field with ice-covered Cottonwood trees; Lamar Valley, Yellowstone National Park, Wyoming.
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 Visitor on Mammoth Terraces Trail viewing Mammoth Hot Springs valley; Yellowstone National Park, Wyoming.
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 Mammoth Hot Springs Hotel - historic lodge at dusk in winter; Yellowstone National Park, Wyoming.
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