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Herd of Bison in the Hayden Valley, Yellowstone National park.
Running Bison or buffalo migrate east across river to better pasture with autumn colors in Lamar Valley of the Yellowstone Ecosystem in western USA of North America. Nearest cities are Jackson, Wyoming, Bozeman and Billings, Montana and Denver, Colorado
A herd of bison grazing on the prairie with mountains in the background. A large bull looks out towards the camera.
Portrait of a curious european otter.
The giant otter or giant river otter[4] (Pteronura brasiliensis) is a South American carnivorous mammal. It is the longest member of the weasel family, Mustelidae, a globally successful group of predators, reaching up to 1.8 m (5 ft 11 in). Atypical of mustelids, the giant otter is a social species, with family groups typically supporting three to eight members
Bison crossing the Firehole River in Yellowstone National Park
Herd of Bisons sitting in Yellowstone National Park, Wyoming, USA.
Bison crossing the Yellowstone river in Yellowstone National Park
Flowing river near orange meadow and pine tree forest inside Yellowstone national park during autumn season, Wyoming, USA.
Grizzly bear making her way along the shore of Yellowstone Lake in Yellowstone Park in western USA of North America.
Wolf watching a Grizzly Bear eating a dead bison, Yellowstone National Park.
Yellowstone River meandering through a valley.
A scenic view with geysers in the background at Yellowstone National Park with a huge grizzly bear walking close to the camera.
A giant moose on n natural habitat
Bison cross the Yellowstone River in the Park's Hayden Valley. in Yellowstone National Park, Wyoming, United States
Adult bison and Calfs in Yellowstone, NP
Grizzly reflections as it crosses pond in Yellowstone National Park
Buffalo (or bison) grazing by warm water river is geyser basin of the Yellowstone Ecosystem in western USA of North America. Nearest cities are Gardiner, West Yellowstone, Livingston, Bozeman and Billings, Montana, Jackson and Cody, Wyoming, Salt Lake City, Utah, and Denver, Colorado.
a bison crossing the Yellowstone river in Wyoming in autumn
A Bear walking on a lake with reflections in a forest near kumho in Finland
Grizzly Bear and Cubs n Yellowstone in autumn
Wild Muskrat in the winter at Christmas time in the Grand Tetons National Park and Yellowstone National Park area. As the snow forms a thick blanket across the Tetons Range, wildlife becomes more visible and the scenery more dramatic than then the busy summer season.
A solitary River Otter is resting in the sunshine on a grass covered riverbank.
Sea Otter on Ice,  Enhydra lutris,  Prince William Sound,  Alaska, in front of Surprise Glacier. Resting on the ice from the glacier.
Wild and mighty American buffalos or bison grazing on pasture and open lands in Yellowstone National Park against blue cloud sky. The bison moving around in herds and some individuals grazing on their own.
Grizzly bear wading, swimming, exploring the Lamar river in the Yellowstone Ecosystem of western USA in North America. Nearest cities are Denver, Colorado, Salt Lake City, Jackson, Wyoming, Gardiner, Cooke City, Bozeman, and Billings, Montana,
European otter (Lutra lutra) is swimming underwater
Elephant swimming in the Mankwe dam, Pilanesberg National Park.
Yellowstone National Park
Shiras' Cow Moose in East Central Idaho.
Free Images: "bestof:yellowstone national park river otter outdoor NPS photo by Neal Herbert NPS photo by Neal Herbert"
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