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  • Colorful ice surrounds Lower Yellowstone Falls in winter in Yellowstone National Park, Wyoming. Lower Yellowstone Falls plunges 308 feet (94 meters) and is the highest-volume waterfall in the Rocky Mountains. Some of the unusual coloring on the ice is the result of mineral-rich rock dust that has been eroded and deposited by the Yellowstone River. The blue icicles result from the ice being uniform and free of bubbles, so it reflects only blue wavelengths of light.
    Yellowstone-Falls-Lower_Winter_Color...jpg
  • Upper Yellowstone Falls, a 109-foot (33-meter) waterfall in the Grand Canyon of the Yellowstone, is surrounded by ice during the winter in Yellowstone National Park, Wyoming.
    Yellowstone-Falls-Upper_Winter_0024.jpg
  • A North American river otter (Lontra canadensis) walks on ice covering the Yellowstone River next to a patch of open water in Yellowstone National Park, Wyoming.
    Otter-River_Yellowstone-River_Frozen...jpg
  • A North American river otter (Lontra canadensis) swims in the Yellowstone River as two others watch from a perch on an ice shelf in Yellowstone National Park, Wyoming.
    Otters-River_Yellowstone-River_Froze...jpg
  • A late spring sunset lights up the sky and reflects in the waters of the Yellowstone River as it winds through the Hayden Valley in Yellowstone National Park, Wyoming.
    Yellowstone_Yellowstone-River_Hayden...jpg
  • A coyote (Canis latrans) walks on the frozen Yellowstone River to hunt for prey in Yellowstone National Park, Wyoming.
    Coyote_Yellowstone-River_Frozen_9271.jpg
  • A coyote (Canis latrans) walks on the frozen Yellowstone River to hunt for prey in Yellowstone National Park, Wyoming.
    Coyote_Yellowstone-River_Frozen_9288.jpg
  • A coyote (Canis latrans) walks on the frozen Yellowstone River to hunt for prey in Yellowstone National Park, Wyoming.
    Coyote_Yellowstone-River_Frozen_9316.jpg
  • A North American river otter (Lontra canadensis) prepares to dive into a patch of open water on the otherwise frozen Yellowstone River as two other otters rest on the ice in Yellowstone National Park, Wyoming.
    Otters-River_Yellowstone-River_Froze...jpg
  • A coyote (Canis latrans) stands on ice covering the Yellowstone River while a North American river otter (Lontra canadensis) observes it from open water in Yellowstone National Park, Wyoming.
    Coyote_Yellowstone-River_Frozen_9453.jpg
  • A North American river otter (Lontra canadensis) sleeps next to a small hole in the ice covering the Yellowstone River in Yellowstone National Park, Wyoming.
    Otter-River_Yellowstone-River_Frozen...jpg
  • Two North American river otters (Lontra canadensis) rest while another stands watch on ice covering most of the Yellowstone River in Yellowstone National Park, Wyoming.
    Otters-River_Yellowstone-River_Froze...jpg
  • A bull Yellowstone Moose (Alces alces shirasi) feeds on willow shrubs as the winter sun rises in the Lamar Valley of Yellowstone National Park, Wyoming. Bull moose typically have antlers, but they lose them in the winter in order to conserve energy. The Yellowstone moose is the smallest of the four subspecies of moose found in North America, although it is the largest member of the deer family that resides in the park.
    Moose_Willow-Shrubs_Winter_Yellowsto...jpg
  • The Grand Canyon of Yellowstone is filled with mist from Lower Yellowstone Falls, backlit by the morning sun.
    Yellowstone_Canyon-Wall_Mist_1158.jpg
  • A coyote (Canis latrans) and North American river otters (Lontra canadensis) stare at each other while standing on ice covering most of the Yellowstone River in Yellowstone National Park, Wyoming. The river otters were safe during this encounter. Anytime the coyote threatened, they dove into the water.
    Yellowstone-River_Coyote_River-Otter...jpg
  • A North American river otter (Lontra canadensis) prepares to dive into a patch of open water on the otherwise frozen Yellowstone River in Yellowstone National Park, Wyoming.
    Otter-River_Diving_Yellowstone-River...jpg
  • A North American river otter (Lontra canadensis) dives into a patch of open water on the otherwise frozen Yellowstone River in Yellowstone National Park, Wyoming.
    Otter-River_Diving_Yellowstone-River...jpg
  • A long exposure captures plumes rising from eruptions of both Old Faithful (right) and Grand Geyser (left) at dawn in the Upper Geyser Basin of Yellowstone National Park, Wyoming. Yellowstone is home to the world's largest concentration of active geysers, with more than 400 geysers in its Upper Geyser Basin alone.
    Yellowstone_Upper-Geyser-Basin_Old-F...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Steam rises from Angel Terrace, which is lightly dusted in autumn snow, at sunset in Yellowstone National Park, Wyoming. Angel Terrace is part of the Mammoth Upper Terraces, located at the north end of Yellowstone.
    Yellowstone_Angel-Terrace_Sunset_588...jpg
  • Tangled Creek in Yellowstone National Park, Wyoming, curves through a patch of dead lodgepole pine trees that have a silica crust at their base, resembling bobby socks. The trees are in the Black Sand Basin of Yellowstone, a geothermal area. When the hot spring runoff shifted, the trees absorbed the silica-rich water.
    Yellowstone_Tangled-Creek_Bobby-Sock...jpg
  • Tangled Creek in Yellowstone National Park, Wyoming, curves through a patch of dead lodgepole pine trees that have a silica crust at their base, resembling bobby socks. The trees are in the Black Sand Basin of Yellowstone, a geothermal area. When the hot spring runoff shifted, the trees absorbed the silica-rich water.
    Yellowstone_Tangled-Creek_Bobby-Sock...jpg
  • Colorful bacterial mats originating from the bubbling Chinese Spring point toward Firehole River in the Upper Geyser Basin area of Yellowstone National Park in Wyoming. Almost every geyser and hot spring in Yellowstone hosts bacteria. Here, the bright orange streaks are the result of Cyanobacteria Phormidium.
    Yellowstone_Chinese-Spring_Firehole-...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Steam rises from Angel Terrace, which is lightly dusted in autumn snow, at sunset in Yellowstone National Park, Wyoming. Angel Terrace is part of the Mammoth Upper Terraces, located at the north end of Yellowstone.
    Yellowstone_Angel-Terrace_Sunset_591...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Two lodgepole pine trees stand in a snow-covered landscape in the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine_Snags_Sno...jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • Tangled Creek in Yellowstone National Park, Wyoming, curves through a patch of dead lodgepole pine trees that have a silica crust at their base, resembling bobby socks. The trees are in the Black Sand Basin of Yellowstone, a geothermal area. When the hot spring runoff shifted, the trees absorbed the silica-rich water.
    Yellowstone_Tangled-Creek_Bobby-Sock...jpg
  • A bull elk stands on a hill next to the Roosevelt Arch, which marked the first major entrance into Yellowstone National Park. The arch, located in Gardiner, Montana, is inscribed with the words, "For the benefit and enjoyment of the people," a quote from the Organic Act of 1872, which created Yellowstone, the first national park. The arch was named for President Theodore Roosevelt who was visiting the park during the construction of the arch; he asked to place its cornerstone.
    Yellowstone_Roosevelt-Arch_Elk_5852.jpg
  • Dead lodgepole pine trees cast shadows on the snow covering the Lower Geyser Basin in Yellowstone National Park, Wyoming. Lodgepole pine trees have a very shallow root system that extends sideways, allowing them to grow in Yellowstone where there is only a thin layer of topsoil that contains few nutrients. These snags, however, are near an active hydrothermal area and they soaked up mineral-laden water.
    Yellowstone_Lodgepole-Pine-Snags_Sno...jpg
  • A raven flies past the Old Faithful geyser as it erupts in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Raven_Yellowst...jpg
  • Three American bison (Bison bison) graze in deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Three-Grazing_Yellowstone...jpg
  • An American bison (Bison bison) forces its way through deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_4275sq.jpg
  • Two Plains bison (Bison bison) fight in an open area in the Fountain Flat area of Yellowstone National Park, Wyoming. Plains bison are often mistakenly referred to as buffalo; they share only a distant relationship with true buffalo.
    Bison_Yellowstone_Fighting_Fountain-...jpg
  • A red fox (Vulpes vulpes) licks its lips while resting in the snow in Yellowstone National Park, Wyoming.
    Fox-Red_Resting_Winter_Yellowstone_6...jpg
  • A red fox (Vulpes vulpes) yawns from its resting spot in the snow in Yellowstone National Park, Wyoming.
    Fox-Red_Yawning_Winter_Yellowstone_6...jpg
  • A family of four trumpeter swans (Cygnus buccinator) swims in the Firehole River in winter in Yellowstone National Park, Wyoming. The Firehole River is supplied mainly by runoff from geysers and hot springs, so it does not freeze in the winter, even when temperatures plunge well below freezing.
    Swans-Trumpeter_Firehole-River_Winte...jpg
  • A bison (Bison bison) pees in view of another bison in a field in Yellowstone National Park, Wyoming.
    Bison_Peeing_Yellowstone_4276.jpg
  • The reddish last light of day colors ridges on both sides of the Lamar Valley in Yellowstone National Park, Wyoming. The Lamar River, still mostly covered by winter snow, is visible as a thin strip near the bottom of the image.
    Yellowstone_Lamar-Valley_Winter-Suns...jpg
  • A mountain chickadee (Poecile gambeli) looks out from its perch as it looks for food in a Douglas fir tree in Yellowstone National Park, Wyoming. They feed on insects during the breeding season and conifer seeds through the remainder of the year.
    Chickadee-Mountain_Perched_Yellowsto...jpg
  • Grasses emerge from the sparkling late winter snow in Yellowstone National Park, Wyoming.
    Yellowstone_Late-Winter-Snow_Grasses...jpg
  • A coyote (Canis latrans) rests in the snow along the Madison River in Yellowstone National Park, Wyoming.
    Coyote_Madison-River_Winter_Yellowst...jpg
  • A coyote (Canis latrans) stands in a snow-covered field as it searches for food in Yellowstone National Park, Wyoming.
    Coyote_Snow_Yellowstone_8039.jpg
  • A coyote (Canis latrans) pounces in deep snow for a mouse near the Madison River in Yellowstone National Park, Wyoming. The coyote has a highly developed sense of smell and is able to find food by smelling it below the snow.
    Coyote_Hunting_Snow_Yellowstone_5093.jpg
  • A coyote (Canis latrans) walks on an ice-covered road as bison graze in the distance in the Lamar Valley of Yellowstone National Park, Wyoming.
    Coyote_Bison_Snow_Yellowstone_8036.jpg
  • The Old Faithful geyser erupts in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Runoff_Yellows...jpg
  • A large Douglas fir (Pseudotsuga menziesii) stands in contrast to the snow-dusted forest at a slightly higher elevation in the early autumn in the Lamar Valley of Yellowstone National Park, Wyoming.
    Yellowstone_Douglas-Fir_Boulders_Lam...jpg
  • Steam rising from the geothermal features in the Norris Geyser Basin turns to ice as it touches trees on a frigid day in Yellowstone National Park, Wyoming. Temperatures on this day approached 0 degrees Fahrenheit (-20 degrees Celsius).
    Yellowstone_Norris-Geyser-Basin_Ice_...jpg
  • An American dipper (Cinclus mexicanus) dives from an ice shelf into Soda Butte Creek in Yellowstone National Park, Wyoming. American dippers, also known as water ouzels, are known for diving underwater to catch aquatic insects and their larvae.
    Dipper-American_Diving_Winter_Yellow...jpg
  • A small herd of bison (Bison bison) stand on a snow-covered ridge in the Lamar Valley of Yellowstone National Park, Wyoming. Their tracks are faintly visible in the snow on the slope leading up to them.
    Bison_Small-Herd_Snow_Lamar-Valley_Y...jpg
  • An American bison (Bison bison) runs in the snow near Junction Butte in Yellowstone National Park, Wyoming. Bison are well equipped for harsh winter conditions. They grow a winter coat of woolly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_5292.jpg
  • A moose (Alces alces) trudges through deep snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose are known as elk in Eurasia and are the largest and heaviest living members of the deer family. Males, known as bulls, grow fresh antlers each year, dropping them in the winter.
    Moose_Winter_Yellowstone_8786.jpg
  • A moose (Alces alces) trudges through deep snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose are known as elk in Eurasia and are the largest and heaviest living members of the deer family. Males, known as bulls, grow fresh antlers each year, dropping them in the winter.
    Moose_Winter_Yellowstone_8751.jpg
  • A lodgepole pine tree (Pinus contorta) grows around a large boulder on Junction Butte in Yellowstone National Park, Wyoming.
    Yellowstone_Lodgepole-Pine_Boulder_5...jpg
  • A herd of bison (Bison bison) graze in an open field against a backdrop of steaming geothermal features in the Midway Geyser Basin of Yellowstone National Park, Wyoming.
    Yellowstone_Midway-Geyser-Basin_Biso...jpg
  • A red fox (Vulpes vulpes) hunts for food in a vast, snow-covered landscape along the Lamar River in Yellowstone National Park, Wyoming.
    Fox-Red_Yellowstone_Lamar-Valley_Vas...jpg
  • A bull elk (Cervus canadensis) stands along the Madison River in Yellowstone National Park, Wyoming.
    Elk_Yellowstone_Madison-River_Snow_2...jpg
  • A large moose (Alces alces) feeds on shrubs in the snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose, which are known as elk in Eurasia, have thick skin and other features that make them well-adapted for cold weather.
    Moose_Snow_Feeding_Yellowstone_0963.jpg
  • A large moose (Alces alces) browses for shrubs in the snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose, which are known as elk in Eurasia, have thick skin and other features that make them well-adapted for cold weather.
    Moose_Snow_Yellowstone_9875.jpg
  • A coyote (Canis latrans) climbs up onto a snow-covered log after crossing a shallow portion of the Madison River in Yellowstone National Park, Wyoming.
    Coyote_Madison-River_Yellowstone_487...jpg
  • A long exposure captures the motion of the spray erupting from the Old Faithful at dawn in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Dawn_Yellowsto...jpg
  • An American bison (Bison bison) stands among trees as snow falls along the Firehole River in Yellowstone National Park, Wyoming. Bison are well-equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Trees_Yellowstone_6536.jpg
  • An American bison (Bison bison) walks in deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_4420.jpg
  • A strip of Mount Hornaday is visible between snow clouds and trees coated in fresh snow in Yellowstone National Park, Wyoming. Mount Hornaday is a 10,003-foot (3,049-meter) mountain that is part of the Absaroka Range.
    Yellowstone_Mount-Hornaday_Snow-Stor...jpg
  • A coyote (Canis latrans) prepares to pounce in the snow for prey in a field along the Madison River in Yellowstone National Park, Wyoming.
    Coyote_Hunting_Snow_Yellowstone_2868.jpg
  • An American dipper (Cinclus mexicanus) dives from an ice shelf into Soda Butte Creek in Yellowstone National Park, Wyoming. American dippers, also known as water ouzels, are known for diving underwater to catch aquatic insects and their larvae.
    Dipper-American_Diving_Winter_Yellow...jpg
  • An American dipper (Cinclus mexicanus) feeds while standing on an ice shelf over Soda Butte Creek in Yellowstone National Park, Wyoming. American dippers, also known as water ouzels, are known for diving underwater to catch aquatic insects and their larvae.
    Dipper-American_Feeding_Winter_Yello...jpg
  • A red fox (Vulpes vulpes) looks up from its resting spot in the snow in Yellowstone National Park, Wyoming.
    Fox-Red_Resting_Winter_Yellowstone_5...jpg
  • A bighorn sheep (Ovis canadensis) rests between two trees on a ledge at the edge of the Lamar Valley in Yellowstone National Park, Wyoming.
    Bighorn-Sheep_Resting_Yellowstone_39...jpg
  • A black-billed magpie (Pica hudsonia) takes fur from the back of a bighorn sheep (Ovis canadensis), perched on a rocky ledge as the snow falls in Yellowstone National Park, Wyoming.
    Bighorn-Sheep_Magpie_Taking-Fur_Yell...jpg
  • Two coyotes (Canis latrans) show their teeth to establish dominance before attempting to mate with a female, shown watching in the snow in the Lamar Valley of Yellowstone National Park, Wyoming.
    Coyotes_Fighting_Mate_Yellowstone_47...jpg
  • A lodgepole pine tree (Pinus contorta) grows against a large lichen-covered boulder on Junction Butte in Yellowstone National Park, Wyoming.
    Yellowstone_Lodgepole-Pine_Boulder_5...jpg
  • A narrow strip of the Lamar River is visible between the ice and snow that covers the Lamar Valley in winter in Yellowstone National Park, Wyoming.
    Yellowstone_Lamar-River_Ice_8260.jpg
  • A coyote (Canis latrans) sniffs to detect food beneath the snow on the Blacktail Plateau in Yellowstone National Park, Wyoming.
    Coyote_Snow_Sniff_Yellowstone_4550.jpg
  • A large moose (Alces alces) browses for shrubs in the snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose, which are known as elk in Eurasia, have thick skin and other features that make them well-adapted for cold weather.
    Moose_Snow_Yellowstone_0792.jpg
  • A row of trees at the edge of Iron Spring Creek are encased in ice in the Black Sand Basin of Yellowstone National Park, Wyoming. The Black Sand Basin is home to a number of geothermal features. During the winter, steam can rise from them and freeze to nearby trees.
    Yellowstone_Ice-Encased-Trees_Black-...jpg
  • A large snag grows along Gibbon Falls, an 84-foot (26-meter) waterfall on the Gibbon River in Yellowstone National Park, Wyoming.
    Yellowstone_Gibbon-Falls_Snag_Winter...jpg
  • The spray from the erupting Old Faithful geyser takes on a slight red hue at the first light of day in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Dawn_Yellowsto...jpg
  • A few stars are visible in the sky as Old Faithful erupts at dawn in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Dawn_Yellowsto...jpg
  • Stars are visible in the sky as Old Faithful erupts at dusk in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
    Old-Faithful_Eruption_Dusk_Yellowsto...jpg
  • Two American bison (Bison bison) fight as another bison watches in the Fountain Flat area of Yellowstone National Park, Wyoming.
    Bison_Yellowstone_Fighting_Fountain-...jpg
  • A coyote (Canis latrans) with a snow-covered nose sniffs for food in a field near the Madison River in Yellowstone National Park, Wyoming. The coyote has a highly developed sense of smell and is able to find food by smelling it below the snow.
    Coyote_Snowy-Nose_Yellowstone_7884.jpg
  • An American bison (Bison bison) stands in the Firehole River as snow falls in Yellowstone National Park, Wyoming.
    Bison_Firehole-River_Winter_Yellowst...jpg
  • Snow covers the banks along the Gibbon River where it makes a dramatic bend near the Gibbon Geyser Basin in Yellowstone National Park, Wyoming.
    Yellowstone_Gibbon-River_Curve_Winte...jpg
  • A coyote (Canis latrans) walks among the golden grasses in a snow-covered field in search of food in Yellowstone National Park, Montana.
    Coyote_Snowy-Field_Yellowstone_8084.jpg
  • An American bison (Bison bison) forces its way through deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equipped for harsh winter conditions. They grow a winter coat of woolly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_4275.jpg
  • Low clouds drop fresh snow onto evergreen trees at the base of Mount Hornaday in the Lamar Valley of Yellowstone National Park, Wyoming. Mount Hornaday, with an elevation of 10,003 feet (3,049 meters), is part of the Absaroka Range of mountains.
    Yellowstone_Mount-Hornaday_Snowing_5...jpg
  • A variety of thermophiles, which are microorganisms that thrive in heat, are responsible for the colors in the Grand Prismatic Spring, located in the Midway Geyser Basin area of Yellowstone National Park, Wyoming. The yellow-green color comes from the thermophilic cyanobacteria Synechococcus, which is found in the hottest water of the spring (up to 161°F or 72°C). Phormidium, which is orange, is found in the spring's middle temperatures (113-140°F or 45-60°C). Calothrix, which is brown or black, is found in the coolest temperatures, although not lower than 86°F or 30°C. The terraces are the result of minerals that solidify in water that spills out of the spring.
    Yellowstone_Grand-Prismatic-Spring_B...jpg
  • A red fox (Vulpes vulpes) tries to blend in among the snow-covered grasses near the Blacktail Plateau in Yellowstone National Park, Wyoming.
    Fox-Red_Snow_Grass_Yellowstone_6111.jpg
  • A Plains bison (Bison bison) walks in a heavy snow storm in a field near the Madison River in Yellowstone National Park, Wyoming. American bison are sometimes mistakenly referred to as buffalo; they are only distantly related to true buffalo.
    Bison_Yellowstone_Snow-Storm_3907.jpg
  • Steam rises from the colorful terraces of Palette Spring in the Mammoth area of Yellowstone National Park, Wyoming. The rich color of the spring comes from microbial mats and the overall appearance varies throughout the year because of weather. In this early autumn image, Oscillatoria microbes are producing a rich orange; those microbes are most active when the temperature is less than 68 degrees Fahrenheit (20 Celcius).
    Yellowstone_Palette-Spring_Steam_581...jpg
  • A Plains bison (Bison bison) stands in a heavy snow storm next to a canyon wall over the Gibbon River in Yellowstone National Park, Wyoming. American bison are sometimes mistakenly referred to as buffalo; they are only distantly related to true buffalo.
    Bison_Yellowstone_Snow-Storm_4089.jpg
  • Steam rises from Orange Spring Mount, a hot spring in the Mammoth area of Yellowstone National Park, Wyoming. Orange Spring Mound is a large cone-type hot spring, composed of hot-spring deposits. It has a fissure ridge that extends from one side to the other, serving as a dam behind which travertine deposits accumulate.
    Yellowstone_Orange-Spring-Mound_1531.jpg
  • Old Faithful, the most famous geyser in Yellowstone National Park, Wyoming, erupts, sending a cloud of steam into the air that somewhat mimics the clouds in the sky. The geyser's eruptions are not as predictable as the name Old Faithful might suggest. Eruptions can occur as little as 45 minutes apart or with a gap as long as 125 minutes. The geyser's height also varies; at times the column of water can reach 184 feet (56 meters) high.
    Yellowstone_Old-Faithful_Erupting_31...jpg
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