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American Bison, Buffalo
Landscape of geyser basin with smoke and background of pine forest inside hot zone of Yellowstone National Park, Wyoming, USA.
Bison or buffalo bull digs his way through deep snow during a heavy snow fall in Yellowstone's Lamar Valley in Wyoming and Montana USA
A bison runs through a field of snow in Yellowstone National Park
Bison, buffalo, Grand Teton National Park, Wyoming
Old Faithful geyser erupts at Yellowstone National Park as a young bison grazes nearby. The famous geyser erupts at an average interval of 90 mins, expelling up to 8,400 gallons of boiling water at up to 184 feet high.
Norris Geyser Basin in Yellowstone in Winter
American Bison in front of geysers in Yellowstone National Park
Yellowstone Backcountry in Winter 1986
Old Faithful Yellowstone National Park, Wyoming, USA.
American Bison (Bos bison) on a mountain ridge in winter snow. Yellowstone National Park, Wyoming
Norris Geyser Basin, Yellowstone, Wyoming - United States of America
Grey (or gray) wolf looking over buffalo (bison) on snow covered hill.  This wolf is a large canine native to Eurasia and North America. The wolf is the largest extant member of the family Canidae, males average 88 lbs. and females average 82 lbs. The grey wolf can be various colors.  The banded fur is usually mottled white, brown, gray, and black. This was near Tower junction in Yellowstone National Park between Gardiner and Cooke City Montana. Larger nearby cities are Bozeman and Billings, Montana. John Morrison Photographer
Bison standing in a mountains
Bison crossing the Firehole River in Yellowstone National Park
Bison standing in meadow in Yellowstone National Park with frost on fur on a very cold morning in winter with snow on the ground
Old Faithfull Geyser, Yellowstone National Park
Bison, buffalo, Utah
American Bison, Bison bisoon, in the winter snow in Yellowstone National Park, Wyoming.
Panoramic extremely colorful Grand Prismatic Springs from a distance with bright blue sky and light steam lifting off lake of rainbow colors
Bison (buffalo) block access to Yellowstone River bridge in northwestern Wyoming bordering Montana, USA
yellowstone national park - the emerald pool with bison roaming in background
Old Faithful Geyser Eruption\nYellowstone National Park
Grand Prismatic Hot Spring
A wide view of a herd of buffalo grazing in Custer State National Park, with two buffalo licking salt off the road, and a little snow evident.
Taken with Canon 5 D in Yellowstone National Park
American Bison (Bos bison, Bison bison) Herd  Grazing in the Rolling Winter Hills of Yellowstone National Park, Wyoming
American Bison, Bison bison, Winter in Yellowstone National Park, Wyoming. Feeding as a herd in the open snow covered plain.
The iconic american bison in Yellowstone's Lamar Valley during the cold winter months.
Yellowstone National Park’s thermal features can be seen as the product of millions of years of geology at work.  Geysers are hot springs that erupt periodically. The eruptions is the result of super-heated water below-ground becoming trapped in channels leading to the surface.
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