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Morning Glory Pool, a geothermal pool, colours are due to algae at temperature bands, hotter below, Yellowstone National Park, Wyoming, USA

Coyote (Canis latrans), weighing 30-40 lbs, less than half the weight of a wolf, Yellowstone National Park, Wyoming, USA

Cliff Geyser erupts from geyserite bank on edge of Firehole River through Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Winter landscape, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Regenerating trees reflected in a frosty and misty Lewis River at dawn, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Daisy Geyser, one of the most predictable, erupts at an angle, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists on boardwalk in silhouette, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison), Hayden Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Morning Glory Pool and surrounds, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cold tourists on seat surrounded by steam, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Dead trees and steam with mountain backdrop and blue skies, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fallen lodgepole pines, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fishing Cone Geyser with freezing mists, Yellowstone Lake at West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black bear (Ursus americanus) sow nursing a spring cub, Yellowstone National Park, Wyoming, United States of America, North America

Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Two bison (Bison bison) bulls facing off, Yellowstone National Park, Wyoming, United States of America, North America

Uinta Ground Squirrel (Urocitellus armatus) among Mountain Bluebell (Mertensia ciliata), Yellowstone National Park, Wyoming, United States of America, North America

Red Fox (Vulpes vulpes) (Vulpes fulva) vixen and kit, Yellowstone National Park, Wyoming, United States of America, North America

Three Grizzly Bear (Ursus arctos horribilis) cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

Great gray owl (great grey owl) (Strix nebulosa) adult leaving a perch, Yellowstone National Park, Wyoming, United States of America, North America

Great gray owl (great grey owl) (Strix nebulosa) female and 8-day-old chick, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) kit pouncing on its sibling, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) vixen hunting a bird, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow and two cubs of the year all standing up on their hind legs, Yellowstone National Park, Wyoming, United States of America, North America

River otter (Lutra canadensis) on frozen Yellowstone Lake, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Common raven (Corvus corax) feeding on a duck, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Fog mingling with evergreen trees with some cottonwoods, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull and cow, Yellowstone National Park, Wyoming, United States of America, North America

Two Pronghorn (Antilocapra americana) bucks sparring, Yellowstone National Park, Wyoming, United States of America, North America

Three American avocet (Recurvirostra americana), Yellowstone National Park, Wyoming, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) carrying a pup, Yellowstone National Park, Wyoming, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) carrying a pup, Yellowstone National Park, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) carrying a pup, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) bull in a spring snowstorm, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Uinta chipmunk (Tamias umbrinus), Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Young mule deer (Odocoileus hemionus) in a snow storm in the spring, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) covered with snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) covered with snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow and newborn calf, Yellowstone National Park, Wyoming, United States of America, North America

Black Bear (Ursus americanus) sow and yearling cub playing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), yearling cub, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black Bear (Ursus americanus) sow and yearling cub playing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Coyote (Canis latrans) in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lower Falls, Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), yearling cub, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Walkway, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Elk herd, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis) sow and two cubs of the year or spring cubs standing, Yellowstone National Park, Wyoming, United States of America, North America

Visitors, steam and vivid colours, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black bear (Ursus americanus) sow and cub of the year, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), yearling cub, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) calf, Yellowstone National Park, Wyoming, United States of America, North America

River Otter (Lutra canadensis) pup, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow cleaning her calf, Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) in a spring snow storm, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis) sow and two cubs of the year or spring cubs standing, Yellowstone National Park, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), yearling cub, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

River Otter (Lutra canadensis) pups, Yellowstone National Park, Wyoming, United States of America, North America

Uinta Ground Squirrel (Urocitellus armatus) among Mountain Bluebell (Mertensia ciliata), Yellowstone National Park, Wyoming, United States of America, North America

Yellow-headed blackbird (Xanthocephalus xanthocephalus), Yellowstone National Park, Wyoming, United States of America, North America

Fog among a hillside with evergreens, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone Star Geyser erupts and creates rainbow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cinnamon Black Bear (Ursus americanus) yearling cub, Yellowstone National Park, Wyoming, United States of America, North America

Firehole Spring, Firehole Lake Drive, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull covered with snow in snowfall in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Old Faithful geyser blowing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourist taking a photograph of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black Bear (Ursus americanus) sow and cub, Yellowstone National Park, Wyoming, United States of America, North America

Young elk (Cervus canadensis), crossing amongst traffic along the Madison River, Yellowstone National Park, Wyoming, United States of America, North America

Fog mingling with evergreen trees with some cottonwoods, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cinnamon black bear (Ursus americanus), Yellowstone National Park, Wyoming, United States of America, North America

Black Bear (Ursus americanus) sow and two chocolate cubs-of-the-year, Yellowstone National Park, Wyoming, United States of America, North America

Yellowstone River and Falls, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Chromatic Pool and surrounds on a clear day, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America