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  1. A frost-covered American bison bull (Bison bison) walks through the snow in Yellowstone National Park; United States of America
  2. Portrait of an American bison cow (Bison bison) standing in blue light with its fur covered in frost created from the extreme cold and geothermal steam; Yellowstone National Park, Wyoming, United States of America
  3. An American black bear cub (Ursus americanus) sits on a snow covered Whitebark pine tree (Pinus albicaulis) branch looking around in Yellowstone National Park; Wyoming, United States of America
  4. Frost covered herd of American bison (Bison bison) one lying down and others standing as still as possible in the background to conserve energy on the relatively warm, geothermally heated ground while coping with the cold February morning and moving to deep snow only when hungry to conserve energ...
  5. Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States.
  6. A bison bull (Bison bison) soaks up the winter sun standing near a travertine rock to block the wind, close to the sunny south side of the Soda Butte Cone in Lamar Valley; Yellowstone National Park, Wyoming, United States of America
  7. Portrait of a frost covered bison (Bison bison) standing in a steamy landscape with a golden sunlit glow in Yellowstone National Park; Wyoming, United States of America
  8. Quaking aspen tree trunks (Populus tremuloides) in a woodland in Yellowstone National Park; Wyoming, United States of America
  9. Portrait of an American black bear cub (Ursus americanus) looking at camera and climbing a tree in Yellowstone National Park. The American black bear is one of eight species of bear in the world and one of three on the North American continent; Wyoming, United States of America
  10. An America bison (Bison bison) forages during a snow storm in Yellowstone National Park; Wyoming, United States of America
  11. Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States.
  12. Vibrant colours of the Grand Prismatic Spring in Midway Geyser Basin of Yellowstone National Park; Wyoming, United States of America
  13. An America bison (Bison bison) forages near a stream during a snow storm in Yellowstone National Park; Wyoming, United States of America
  14. American Bison At The Midway Geyser Basin, Yellowstone National Park, Wyoming
  15. Snow-Covered Bison At Firehole River, Yellowstone National Park, Wyoming
  16. Water pours from the antlers of a bull moose (Alces alces) lifting his head from Beaverdam Creek in Yellowstone National Park; Wyoming, United States of America
  17. American Bison (Bison bison) stands on the snow covered landscape keeping warm from the thermal steam of Old Faithful illuminated by the golden light of sunrise in the Upper Geyser Basin; Yellowstone National Park, United States of America
  18. An American bison (Bison bison) calf stands next to an adult in Yellowstone National Park; Wyoming, United States of America
  19. Herdn Bison At The Midway Geyser Basin, Yellowstone National Park, Wyoming
  20. Portrait of a brown bear cub (Ursus arctos) balancing on its hind legs, standing upright with its arms outstretched; Montana, United States of America
  21. Frost coated branches on aspen trees; United States of America
  22. Bull elks (Cervus canadensis) graze in a snow covered prairie in Yellowstone National Park; Wyoming, United States of America
  23. Scenic view of the Yellowstone River with Absaroka range backdrop; Montana, United States of America
  24. American black bear (Ursus americanus) on top of a rocky ledge foraging along the banks of the Yellowstone River, climbing randomly around huge granite boulders up a cliff with fall colored foliage, eating leafy plants along the route, Yellowstone National Park; Wyoming, United States of America
  25. Portrait Of A Snow-Covered Bison Standing In A Snowstorm, Yellowstone National Park
  26. Snow covers the branches of a lodgepole pine tree (Pinus contorta); United States of America
  27. Fairy Falls in Yellowstone National Park; Wyoming, United States of America
  28. Sunlit sulphuric rock of the cliffs surrounding the Lower Falls of the Yellowstone River in the Grand Canyon of the Yellowstone; Yellowstone National Park, Wyoming, United States of America
  29. Sunlight filters through a forest of aspen trees in autumn in Yellowstone National Park at sunset; Wyoming, United States of America
  30. A bull elk (Cervus canadensis) negotiates deep snow on the Blacktail Plateau in Yellowstone National Park; Wyoming, United States of America
  31. Orange dragonfly, flame skimmer (Libellula saturata) perched on a stick; United States of America
  32. Lamar Valley on a summer evening inYellowstone National Park; Wyoming, United States of America
  33. The Roosevelt Arch, built from rough blocks of columnar basalt, which were quarried near the water tower in Gardiner, Montana, in Yellowstone National Park; Wyoming, United States of America
  34. Lightning in a purple sky during a storm in Yellowstone National Park; Wyoming, United States of America
  35. Portrait of coyote (Canis latrans) standing in a snowbank keeping watch over the wintry landscape; Montana, United States of America
  36. Close-up of the face of a bison bull (Bison bison) with leaves tangled in his ear; Yellowstone National Park, Wyoming, United States of America
  37. Fall Colors At Pacific Creek And The Grand Tetons, Grand Teton National Park, Wyoming
  38. Lamar Valley on an autumn evening inYellowstone National Park; Wyoming, United States of America
  39. Close view of foliage and twisted stem with glistening drops of dew; Aleutian Islands, Alaska, United States of America
  40. Polar Bear Cubs Snuggle Up To Their Mother Along Hudson Bay, Manitoba, Canada
  41. Close-up of The Wave, colorful sandstone rock formation of the Coyote Buttes in the Paria Canyon-Vermilion Cliffs Wilderness; Arizona, United States of America
  42. A road cuts through a prairie in the Crazy Mountains; Montana, United States of America
  43. Wolf (Canis lupus) waiting in snow in Yellowstone National Park; Wyoming, United States of America
  44. Close-up portrait of a raven (Corvus corax); Yellowstone National Park, United States of America
  45. Vibrant yellow foliage on aspen trees and Electric Peak in the background, Gallatin Range in Yellowstone National Park; Montana, United States of America
  46. Colonnade Falls on the Belcher River in Yellowstone National Park; Wyoming, United States of America
  47. Juniper Tree And Sandstone Rock, Grand StaircaseoEscalante National Monument, Utah
  48. Bull elk (Cervus canadensis) stands in a prairie and looks at the camera in Yellowstone National Park; Wyoming, United States of America