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  • The late afternoon sun brings out the golden color of the High Peaks in Pinnacles National Park, California. The High Peaks, some of which are nearly 2,500 feet (750 meters) tall, are partial remnants of the ancient Pinnacles volcano, shifted 190 miles north of its original location due to movement of the San Andreas Fault. Three turkey vultures are visible soaring in the sky above the saddle between two of the peaks.
    Pinnacles-NP_High-Peaks_5713.jpg
  • A female greater sage-grouse (Centrocercus urophasianus) looks out from a grassy area in the Waterton Lakes National Park, Alberta, Canada.
    Grouse_Greater-Sage_Waterton-Lakes_8...jpg
  • Badlands formations known as the Tepees in Petrified Forest National Park, Arizona, are turned golden red near sunset. Tepees, also spelled tipi or teepee, is a tent that is traditionally made of animal skins over wooden poles. While humans have lived for 13,000 years in and around the modern day Petrified Forest National Park, the native dwellings were more commonly pithouses and pueblos.
    AZ_Petrified-Forest_Tepees_Sunset_64...jpg
  • The Carbon River cascades over volcanic rocks left by Mount Rainier's most recent eruption. A dramatic sunset makes Mother Mountain, also located in Mount Rainier National Park, Washington, appear as if it is erupting.
    RainierNP_Carbon-River_Mother-Mounta...jpg
  • An Allen's Chipmunk (Tamias senex) — and its shadow — feeds in the Sequoia National Forest near Kings Canyon National Park, California. Allen's Chipmunks, also known as Large Mountain Chipmunks or Shadow Chipmunks, are found from the coast to the mountains, though only the mountain chipmunks hibernate in the winter. Allen's Chipmunks primarily feed on fungi.
    Chipmunk_Allens_Shadow_8041.jpg
  • A hint of golden sunrise color shines through the dark storm clouds hovering over Wizard Island and Crater Lake in Crater Lake National Park, Oregon. Crater Lake, the deepest fresh water lake in North America, is located in a caldera at the top of what was once Mount Mazama. A massive eruption around 5,700 B.C. caused the mountain to collapse. While the Wizard Island cone is long dormant, there is some hydrothermal activity at the bottom of Crater Lake, suggesting the mountain is still active.
    CraterLake_Stormy-Sunrise_6604.jpg
  • The sunrise colors the storm clouds passing over the mountains along Lake McDonald in Glacier National Park, Montana. Lake McDonald is the largest lake in Glacier National Park, approximately 10 miles (16 km) long, and over a mile (1.6 km) wide. Filling a valley that was carved by glaciers, the lake is 472 feet (130 m) deep.
    GlacierNP_LakeMcDonaldSunrise_1047.jpg
  • A maple tree frames Eagle Lake, the largest freshwater lake in Acadia National Park, Maine. Eagle Lake is 436 acres in size and as much as 110 feet deep. Acadia National Park is located on Mount Desert Island.
    Acadia_Eagle-Lake_0684.jpg
  • Numerous caves are visible a soft rock cliff wall in Bandelier National Monument, New Mexico. The national monument protects caves that were used by humans for shelters more than 11,000 years ago.
    NM_Bandelier_Wall-Texture_1635.jpg
  • Altocumulus clouds, turned pink by the setting sun, fill the sky over badlands formations known as the Tepees in Petrified Forest National Park, Arizona. Tepees, also spelled tipi or teepee, is a tent that is traditionally made of animal skins over wooden poles. While humans have lived for 13,000 years in and around the modern day Petrified Forest National Park, the native dwellings were more commonly pithouses and pueblos.
    AZ_Petrified-Forest_Tepees_Sunset_64...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
  • Mount Rainier is framed by the opening of an ice cave near the Skyline Trail in Mount Rainier National Park, Washington. At 14,411 feet (4,392 meters), Mount Rainier is the tallest mountain in Washington state and the highest point the Cascade mountain range.
    Rainier_Ice-Cave_9049.jpg
  • Heavy rain and hail streak across the golden sky over Hogwallow Flats at daybreak in Shenandoah National Park, Virginia.
    Shenandoah_Hogwallow-Flats_Storm_375...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
  • 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
  • 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
  • Autumn color lines the banks of the Cuyahoga River as it flows through Cuyahoga Valley National Park in Ohio.
    OH_Cuyahoga-Valley-NP_Cuyahoga-River...jpg
  • Heavy rain and hail drop from a storm passing over the Blue Ridge Mountains at daybreak in Shenandoah National Park, Virginia.
    Shenandoah_Mountain-Storm_Daybreak_9...jpg
  • Petroglyphs carved by members of the Fremont Culture are visible in a sheer sandstone face in the Fremont River canyon in Capitol Reef National Park, Utah. The rock face includes symbols of bighorn sheep and other animals as well as people. The Fremont Culture lived in the area from 300-1300 Common Era (CE).
    Capitol-Reef_Petroglyphs_1278.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) rests in the snow along the Madison River in Yellowstone National Park, Wyoming.
    Coyote_Madison-River_Winter_Yellowst...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
  • A handful of evergreen trees stand out against a backdrop of bare winter trees on a hillside overlooking Gos Ventre in Grand Teton National Park, Wyoming.
    Grand-Teton-NP_Winter-Hillside_1975.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
  • 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
  • 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
  • Icicles grow from the branches of a tree near Lake View in Indiana Dunes National Park, Indiana. The ice formed on a 20-degree day when Lake Michigan waves splashed water onto the shore.
    Indiana-Dunes_Frozen-Tree_Lake-View_...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 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
  • 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
  • Lichen grows on exposed rock at Blackrock Summit in Shenandoah National Park, Virginia.
    Shenandoah_Lichen_Blackrock-Summit_9...jpg
  • The cliffs surrounding Mowich Lake in Mount Rainier National Park, Washington, cast their golden reflections on the lake's surface in the late evening.
    RainierNP_Mowich-Lake_Golden-Reflect...jpg
  • A partial moon shines over bare trees on a foggy autumn morning in the Beaver Marsh area of Cuyahoga Valley National Park, Ohio.
    OH_Cuyahoga-Valley-NP_Beaver-Marsh_M...jpg
  • Several layers of Berea sandstone are visible near the top of Brandywine Falls, a 60-foot (18-meter) waterfall located in the Cuyahoga Valley National Park, Ohio. Brandywine Falls drops overs over three different types of rock: Berea sandstone at the top, Bedford shale in the middle and Cleveland shale at the bottom. The newest rock is about 320 million years old; the oldest is about 400 million. The layers were exposed and the waterfall was formed about 10,000 years ago when the last glaciers retreated from the area.
    OH_Cuyahoga-Valley-NP_Brandywine-Fal...jpg
  • The first light of day creates a dramatic light show near St. Mary's, on the east side of Glacier National Park in Montana. The fiery cloud dwarfs the trees below.
    GlacierNP_Big-Sky-Sunrise_St-Marys_0...jpg
  • Ice lines the sides of Yosemite Falls on a cold winter morning in Yosemite National Park, California. At 2,425 feet (739 meters), Yosemite Falls is the highest measured waterfall in North America and the fifth-highest in the world.
    Yosemite_Yosemite-Falls_Ice_9535.jpg
  • Lichen grows on the walls near the entrance of Beauty Cave, a 300-foot (100-meter) long lava tube in the Craters of the Moon National Monument, Idaho.
    CratersOfTheMoon_Beauty-Cave_2519.jpg
  • Trees on the summit ridge of Lost Cabin Mountain vanish into the fog in Olympic National Park, Washington.
    OlympicNP_Lost-Cabin-Mountain_Fog_49...jpg
  • Mount Angeles is obscured by thick clouds and fog. This sunset scene was captured from the summit of a rocky peak along the Hurricane Hill trail in Olympic National Park, Washington.
    OlympicNP_Mount-Angeles_Fog_5024.jpg
  • A pair of yucca plants grow on a large dunes in White Sands National Monument in New Mexico. The white sand dunes are comprised of gypsum crystals, which is rarely found as sand because it is water-soluble. But the Tularosa Basin is surrounded by mountains and there is no direct outlet to the sea for any rain that falls there. Any water eventually drains through the ground leaving the gypsum behind in a crystalline form called selenite. White Sands National Monument is the largest gypsum dune field in the world.
    NM_WhiteSands_YuccaAndDunes_1295.jpg
  • A long exposure captures the motion of storm clouds as they move over the Blue Ridge Mountains in this view from Shenandoah National Park, Virginia.
    Shenandoah_Ridge-View_Cloud-Motion_9...jpg
  • Storm clouds dump heavy rain and hail over the Blue Ridge Mountains in this view from Ridge View in Shenandoah National Park, Virginia.
    Shenandoah_Ridge-View_Sunrise-Storm_...jpg
  • Sediment layers are visible in the badland hills of bluish bentonite clay in an area known as the Blue Mesa in Petrified Forest National Park, Arizona.
    AZ_Petrified-Forest_Blue-Mesa_6618.jpg
  • The Paradise meadow in Mount Rainier National Park, Washington, is full of wildflowers, mainly lupine (Lupinus lepidus) and cottongrass (Eriophorum angustifolium). Mount Rainier stands tall above the meadow. At 14,411 feet (4,392 meters), it is the tallest mountain in Washington state and the highest point the Cascade mountain range.
    Rainier_Paradise-Wildflowers_8997.jpg
  • A hoary marmot (Marmota caligata) feeds on lupine in a meadow that also contains pink mountain-heather near Paradise in Mount Rainier National Park, Washington. Marmots develop thick layers of fat during the summer so that they can hibernate for eight to nine months.
    Marmot-Hoary_Wildflowers_RainierNP_3...jpg
  • Pink mountain-heather (Phyllodoce empetriformis) blooms at the base of a large wildflower meadow at Paradise in Mount Rainier National Park, Washington.
    Rainier_Pink-Mountain-Heather_Paradi...jpg
  • Stars fill the twilight sky over Mount Rainier, which is reflected in one of the Reflection Lakes in Mount Rainier National Park, Washington. The seven stars that make up the Big Dipper are visible just to the left of the volcano's summit. Mount Rainier, which has a summit of 14,411 feet (4,392 meters), is the highest mountain in Washington state and largest volcano in the Cascade Range.
    Rainier_Night-Sky_Stars_Reflection-L...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 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
  • Several rugged islands including Little James Island (foreground) and James Island (background) are framed by large logs on Rialto Beach in Olympic National Park, Washington.
    OlympicNP_Rialto-Beach_Driftwood_815...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 cross-section of petrified wood displays a wide spectrum of colors in the Rainbow Forest of Petrified Forest National Park in Arizona. The petrified wood in the park is made up of almost solid quartz and the colors are the result of impurities in the quartz, such as iron, carbon and manganese. It formed more than 200 million years ago when logs washed into an ancient river system. The logs were quickly buried by sediment, which slowed decay. Over time, minerals, including silica, were absorbed into the porous wood, replacing the original organic material over hundreds of thousands of years.
    AZ_Petrified-Forest_Petrified-Wood_D...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
  • 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
  • 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 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
  • Icicles grow from the branches of a tree near Lake View in Indiana Dunes National Park, Indiana. The ice formed on a 20-degree day when Lake Michigan waves splashed water onto the shore.
    Indiana-Dunes_Frozen-Tree_Lake-View_...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
  • A Staghorn cholla cactus (Opuntia versicolor) in full bloom displays its red flowers against a peak covered in saguaro cacti (Carnegiea gigantea) in Saguaro National Park near Tucson, Arizona.
    Saguaro-NP_Cacti_Spring_Peak_2347.jpg
  • The sun sets in a gap between peaks over the Big Run Basin, the largest single watershed in Shenandoah National Park, Virginia.
    Shenandoah_Big-Run_Sunset_9316.jpg
  • The golden light of sunset highlights the harsh environment near the summit of the High Peaks in Pinnacles National Park, California, illustrated in part by a radically-curved tree. The High Peaks, some of which are nearly 2,500 feet (750 meters) tall, are partial remnants of the ancient Pinnacles volcano, shifted 190 miles north of its original location due to movement of the San Andreas Fault.
    Pinnacles-NP_High-Peaks_Stormy-Sunse...jpg
  • A layer of altocumulus clouds are partially visible through the fog that covers the Beaver Marsh in Cuyahoga Valley National Park, Ohio.
    OH_Cuyahoga-Valley-NP_Beaver-Marsh_4...jpg
  • Brandywine Falls drops 65 feet (20 meters) into a lush gorge in Cuyahoga Valley National Park, Ohio. Brandywine Falls drops overs over three different types of rock: Berea sandstone at the top, Bedford shale in the middle and Cleveland shale at the bottom. The newest rock is about 320 million years old; the oldest is about 400 million. The layers were exposed and the waterfall was formed about 10,000 years ago when the last glaciers retreated from the area. The top Berea sandstone layer is the hardest and protects the softer layers below from the erosive force of the falling water.
    OH_Cuyahoga-Valley-NP_Brandywine-Fal...jpg
  • On an autumn morning, fog envelops Indigo Lake, located in Cuyahoga Valley National Park, Ohio.
    OH_Cuyahoga-Valley-NP_Indigo-Lake_Fo...jpg
  • Brandywine Creek streaks over a layer of Berea sandstone just before it plunges over Brandywine Falls in Cuyahoga Valley National Park, Ohio.
    OH_Cuyahoga-Valley-NP_Brandywine-Cre...jpg
  • A side channel of the Carbon River flows over volcanic rocks displaying a variety of colors in Mount Rainier National Park, Washington.
    RainierNP_Carbon-River_3192.jpg
  • Chenuis Falls drops 285 feet (87 meters) in a couple of tiers before flowing into the Carbon River in Mount Rainier National Park, Washington.
    RainierNP_Chenuis-Falls_3208.jpg
  • The full moon rises over the Grand Canyon and Colorado River in this view from the Tuweep Overlook (also spelled Toroweap) in Grand Canyon National Park, Arizona.  The Tuweep Overlook, located on the north rim of the Grand Canyon, provides one of the most dramatic canyon views. Here, the canyon is 3,000 feet deep and one mile wide — one of the few places on the Grand Canyon rim where you can see both the Colorado River and the other side of the canyon.
    GrandCanyon_Tuweep_Full-Moon_4695.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 Great Blue Heron (Ardea herodias) sits at the top of a snag in the Hoh Rain Forest in Washington's Olympic National Park.
    Olympics_Heron_Snag_9833.jpg
  • The La Ventana Arch, located in the El Malpais National Monument in New Mexico, has a span of about 120 feet (36 meters), making it the second-largest arch in the state. La Ventana is Spanish for "the window."
    NM_El-Malpais_La-Ventana-Arch_1446.jpg
  • Numerous caves are visible a soft rock cliff wall in Bandelier National Monument, New Mexico. The national monument protects caves that were used by humans for shelters more than 11,000 years ago.
    NM_Bandelier_Wall-Texture_1633.jpg
  • A bent pine tree grows near the top of a sandstone column in Zion National Park, Utah.
    Zion_Bent-Tree_8334.jpg
  • The white sand dunes of White Sand Dunes National Monument, New Mexico, appear blue and purple after sunset, reflecting the twilight sky. The white sand dunes are comprised of gypsum crystals, which is rarely found as sand because it is water-soluble. But the Tularosa Basin is surrounded by mountains and there is no direct outlet to the sea for any rain that falls there. Any water eventually drains through the ground leaving the gypsum behind in a crystalline form called selenite. White Sands National Monument is the largest gypsum dune field in the world.
    NM_WhiteSands_Fiery-Sunset_1036.jpg
  • Cumulus clouds frame the setting sun this view from Dickey Ridge in Shenandoah National Park, Virginia.
    Shenandoah_Dickey-Ridge_Sunset_9100.jpg
  • A white-tailed deer (Odocoileus virginianus), also known as the whitetail or Virginia deer, feeds on leaves in Shenandoah National Park, Virginia.
    Deer-Whitetail_Feeding_Shenandoah_38...jpg
  • Sediment layers are visible in the badland hills of bluish bentonite clay in an area known as the Blue Mesa in Petrified Forest National Park, Arizona.
    AZ_Petrified-Forest_Blue-Mesa_Detail...jpg
  • Erosion debris from petrified logs and the bentonite clay hills collects at the base of the badlands of the Blue Mesa in Petrified Forest National Park, Arizona.
    AZ_Petrified-Forest_Blue-Mesa_Erosio...jpg
  • A large moose (Alces alces) walks in deep snow in search for food 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_Walking_Yellowstone_0888.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 gull flies over as the sun begins to set behind Little James Island in Olympic National Park, Washington.
    OlympicNP_Rialto-Beach_Little-James-...jpg
  • A close-up of a a cross-section of petrified wood reveals colors in abstract patterns in the Petrified Forest National Park in Arizona. The petrified wood in the park is made up of almost solid quartz and the colors are the result of impurities in the quartz, such as iron, carbon and manganese. It formed more than 200 million years ago when logs washed into an ancient river system. The logs were quickly buried by sediment, which slowed decay. Over time, minerals, including silica, were absorbed into the porous wood, replacing the original organic material over hundreds of thousands of years.
    AZ_Petrified-Forest_Petrified-Wood_A...jpg
  • Colorful layers of siltstone, mudstone and shale are visible in the badlands near the Blue Mesa in Petrified Forest National Park, Arizona. The layers contain iron and manganese, which provide the pigments for the brilliant and varied colors.
    AZ_Petrified-Forest_Badlands_Painted...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
  • 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
  • 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
  • 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
  • An American bison (Bison bison) stands in the Firehole River as snow falls in Yellowstone National Park, Wyoming.
    Bison_Firehole-River_Winter_Yellowst...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
  • Two bison (Bison bison) trudge 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_Two_Fountain-Flat_Yellows...jpg
  • Icicles grow from the branches of a tree near Lake View in Indiana Dunes National Park, Indiana. The ice formed on a 20-degree day when Lake Michigan waves splashed water onto the shore.
    Indiana-Dunes_Frozen-Tree_Lake-View_...jpg
  • Ice covers rocks and branches along Lake Michigan on a cold afternoon near Beverly Shores in the Indiana Dunes National Park, Indiana.
    Indiana-Dunes_Frozen-Shoreline_6856.jpg
  • A bull elk (Cervus canadensis) walks in a snow-covered field near Madison in Yellowstone National Park, Wyoming.
    Elk_Yellowstone_Snow-Storm_4050.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 cluster of pancake prickly pear cacti (Opuntia chlorotica) in the foreground grow with several other cacti at the base of tall saguaros (Carnegiea gigantea) at dusk in Saguaro National Park near Tucson, Arizona.
    Saguaro-NP_Cacti_Bloom_Sunset_2420.jpg
  • Three saguaro (Carnegiea gigantea) cacti are rendered in silhouette at twilight in Saguaro National Park near Tucson, Arizona. Saguaros can live to be 150 years old, though they do not develop their first arms until they are 75-100.
    Saguaro-NP_Saguaros_Three_Twilight_2...jpg
  • Cirrus clouds fill the sky over the Big Meadows in Shenandoah National Park, Virginia.
    Shenandoah_Big-Meadows_9416.jpg
  • Three arms begin to sprout on a saguaro cactus (Carnegiea gigantea) in Saguaro National Park near Tucson, Arizona. Saguaro are native to the Sonoran Desert and are known for their "arms," which take ages to grow. The saguaro can take 10 years to reach its first inch of height and another 60 years to produce its first flowers. By 95-100 years, saguaros can be 15-16 feet tall and may finally produce their first arm, though some of the cacti never generate one.
    Saguaro-NP_Saguaro_Arms-Starting_080...jpg
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