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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.

Old Faithful Yellowstone National Park, Wyoming, USA.

Herds of buffalo or bison grazing in the grasslands of Yellowstone National Park.

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

American Bison at Lamar Valley in Yellowstone National Park, Wyoming

Fly fishing for trout in Wyoming

A herd of American bison grazing by the banks of the Yellowstone River on an Autumn day.

Herd of Bison in the Hayden Valley, Yellowstone National Park.

lots of bisons get together on the grassland in Yellowstone National Park

Herd of Bisons sitting in Yellowstone National Park, Wyoming, USA.

Huge Bull Elk as Part of a Scenic Background.

Bison drinking water from the waterhole at the end of day. Yellowstone National Park.

Commonly known as a Buffalo roams Wyoming in herds

Norris Geyser Basin, Yellowstone, Wyoming - United States of America

Seven point Elk bull looking toward his cows to keep them close during rutting season. This was in northern Yellowstone near Gardiner, Montana and Mammoth Hot Springs in Yellowstone National Park USA. Closest larger cities are Bozeman and Billings, Montana in western USA.

Bison in Yellowstone National Park. USA

The world's most famous geyser, Old Faithful, remains true to name and erupts.

Norris Geyser Basin in Yellowstone in Winter

Elk at Lake Lodge in Yellowstone National Park, Wyoming

Elk gather around the pools at West Thumb Geyser Basin around dusk in Yellowstone National Park, Wyoming, USA.

Yellowstone National Park, unique landscapes, geothermal features, Old Faithful Geyser, Yellowstone Lake, Grand Canyon of the Yellowstone, hot springs, mud pots, sulfur springs, mineral deposits, wildlife, bison, elk, bear, wolf, forest, river, waterfall, volcanic activity, natural wonder

Herd of elk grazing late winter in Yellowstone National Park. Overall scenic with sweeping vista. mountains in background are in shadow giving cold feeling to overall scene. Animals appear healthy probably due to a light snowfall this year.

Rocky Mountain Elk during the rut

Large herd of bison (buffalo) resting, rolling in dirt and finding mates for the rutting (reproduction) season in Lamar Valley in Yellowstone National Park in western USA in the states of Wyoming and Montana. Nearby communities are Mammoth Hot Springs, Gardiner and Cooke City, Montana. John Morrison Photographer

Old Faithful Yellowstone National Park, Wyoming, USA.

Castle geyser eruption and volcanic activity, Yellowstone national park, Wyoming, USA.

American Bison in front of geysers in Yellowstone National Park

Bison in Yellowstone National Park

Beautiful Majestic Wild Male Elk in Yellowstone National Park

Thermophilic Microbial Mat at Sapphire Pool in Biscuit Basin of Yellowstone National Park, Wyoming

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