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  • A young mountain gorilla (Gorilla beringei beringei) bundles up and sits with its mother as heavy rain falls in Volcanoes National Park in Rwanda. The gorillas are members of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorillas_Wet_0182.jpg
  • A mountain gorilla (Gorilla beringei beringei) looks out while resting in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_7379.jpg
  • A mountain gorilla (Gorilla beringei beringei) sits to rest in the forest of Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Sitting_6800.jpg
  • A mountain gorilla (Gorilla beringei beringei) rests in Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Resting_Clos...jpg
  • A mountain gorilla (Gorilla beringei beringei) feeds on leaves in the rainforest of Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Feeding_Mist...jpg
  • A mountain gorilla (Gorilla beringei beringei) looks out while resting in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Profile_7275.jpg
  • A mountain gorilla (Gorilla beringei beringei) sits in the rain in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_7634.jpg
  • A mountain gorilla (Gorilla beringei beringei) bites down on a small leaf in Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Feeding_6338.jpg
  • A mountain gorilla (Gorilla beringei beringei) is almost completely obscured by thick vegetation as he sits in the rainforest of Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Vegetation_7...jpg
  • A mountain gorilla (Gorilla beringei beringei) feeds on leaves in the rainforest of Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Vegetation_8...jpg
  • A mountain gorilla (Gorilla beringei beringei) sets admist wet vegetation as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Sitting_Mist...jpg
  • A mountain gorilla (Gorilla beringei beringei) sets admist wet vegetation as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Feeding_Mist...jpg
  • A mountain gorilla (Gorilla beringei beringei) bundles up as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_8430.jpg
  • A mountain gorilla (Gorilla beringei beringei) wipes water from its eyes as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_8138.jpg
  • Bright Lewis' monkeyflower (Erythranthe lewisii) plants bloom along a seasonal stream with the Tatoosh mountain range visible in the background in this view from the Skyline Trail in Mount Rainier National Park, Washington. Lewis' monkeyflower is also known as great purple monkeyflower and is native to western North America, primarily found in moist, mountainous areas.
    RainierNP_Monkeyflower_Tatoosh-Range...jpg
  • The Ape Cave makes a sharp bend in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Bend_5094.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 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
  • 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
  • A mountain gorilla (Gorilla beringei beringei) bundles up as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_7710.jpg
  • A young mountain gorilla (Gorilla beringei beringei) sits in thick vegetation in Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Young_Vegeta...jpg
  • A mountain gorilla (Gorilla beringei beringei) feeds on leaves in Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Feeding_6065.jpg
  • A mountain gorilla (Gorilla beringei beringei) sets admist wet vegetation as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Vegetation_8...jpg
  • A young mountain gorilla (Gorilla beringei beringei) yawns while sitting among wet leaves as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Yawning_8542.jpg
  • During a rainstorm, a mountain gorilla (Gorilla beringei beringei) takes shelter under thick brush in the rainforst of Volcanoes National Park, Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Shelter_7233.jpg
  • A mountain gorilla (Gorilla beringei beringei) bundles up as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_7959.jpg
  • A mountain gorilla (Gorilla beringei beringei) bundles up as rain falls in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_Wet_7845.jpg
  • A mountain gorilla (Gorilla beringei beringei) feeds on leaves in the rain forest of Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Feeding_6086.jpg
  • Several lava rocks hang over the floor of the Ape Cave in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is a lava tube, formed during an eruption of Mount St. Helens 2,000 years ago. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The rocks once hung from the ceiling of the cave, but broke off while lava was still flowing through the tube. They traveled with the flow until they became wedged in a narrow passage.
    WA_Ape-Cave_Lava-Rocks_5114.jpg
  • The ceiling of the Ape Cave, a lava tube in the Mount St. Helens National Volcanic Monument in Washington state, somewhat mimics the shape of the passage below. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Ceiling_5111.jpg
  • The ceiling of the Ape Cave, a lava tube in the Mount St. Helens National Volcanic Monument in Washington state, somewhat mimics the shape of the passage below. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Ceiling_5110.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
  • 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
  • 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 mountain gorilla (Gorilla beringei beringei) looks out while resting in Volcanoes National Park in Rwanda. This gorilla is a member of the Umubano group, which means "living together" in Kinyarwanda, the national language of Rwanda.
    Rwanda_Mountain-Gorilla_7447.jpg
  • A young mountain gorilla (Gorilla beringei beringei) caresses the face of its mother in the rain forest of the Volcanoes National Park in Rwanda. The gorillas are members of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorillas_Mother_Chil...jpg
  • A mountain gorilla (Gorilla beringei beringei) closes its eyes to rest in the rain forest of Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Resting_6413.jpg
  • A young mountain gorilla (Gorilla beringei beringei) caresses the face of its mother in the rain forest of the Volcanoes National Park in Rwanda. The gorillas are members of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorillas_Mother_Chil...jpg
  • A Cascade golden-mantled ground squirrel (Callospermophilus saturatus) clings to a rock to rest after foraging in the wildflowers above Paradise in Mount Rainier National Park, Washington. The Cascade golden-mantled ground squirrel is found in the Cascade Mountains of Washington state and British Columbia, Canada.
    Squirrel-Cascade-Golden-Mantled_Rain...jpg
  • The Ape Cave gently curves in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Passage_5087.jpg
  • Two hardened tubes are visible in the Ape Cave, a lava tube located near Mount St. Helens in the Gifford Pinchot National Forest in Washington state. The ape cave formed about 2,000 years ago during the only known period when fluid basaltic lava erupted from the volcano. The outside edges of the lava flow cooled first, providing a crust that allowed fluid lava to continue flowing inside. This period of activity may have lasted a year during which the lava level rose and fell, leading to the unique shapes inside the cave. The Ape Cave lava tube is 13,042 feet (3976 meters) long, ranking as the third-longest in North America. The cave is named for a local hiking club, the St. Helens Apes.
    WA_Ape-Cave_Two-Tubes_5130.jpg
  • A lava rock known as the "meatball" hangs over the floor of the Ape Cave in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is a lava tube, formed during an eruption of Mount St. Helens 2,000 years ago. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The meatball once hung from the ceiling of the cave, but broke off while lava was still flowing through the tube. It traveled with the flow until it became wedged in a narrow passage.
    WA_Ape-Cave_Meatball_5116.jpg
  • A field of flowering goldenrods color the valley below a towering basalt cliff in the Columbia National Wildlife Refuge in Adams County, Washington.
    WA_Columbia-NWR_Goldenrod_Cliffs_758...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
  • Rolling hills in the Temblor Range are covered with a variety of colorful spring wildflowers during a superbloom in the Carrizo Plain National Monument in California. The Carrizo Plain is the largest single native grassland remaining in California and was designated as the Carrizo Plain National Monument in 2001. During superbloom years, an unusually high number of wildflowers blossom at the same time, usually the result of wet winter and spring weather. The seeds may have been dormant for years in the more typically dry desert soil.
    CA_Carrizo-Plain_Temblor-Range_Super...jpg
  • A mountain gorilla (Gorilla beringei beringei) closes its eyes to rest in the rain forest of Volcanoes National Park in Rwanda. The gorilla is a member of the Kwitonda group, which means "humble one" in Kinyarwanda, the national language of Rwanda. The Kwitonda group migrated from the Democratic Republic of Congo and now inhabits the lower slopes of Mount Muhabura in Rwanda.
    Rwanda_Mountain-Gorilla_Resting_6181.jpg
  • A Cascade golden-mantled ground squirrel (Callospermophilus saturatus) clings to a rock to rest after foraging in the wildflowers above Paradise in Mount Rainier National Park, Washington. The Cascade golden-mantled ground squirrel is found in the Cascade Mountains of Washington state and British Columbia, Canada.
    Squirrel-Cascade-Golden-Mantled_Rain...jpg
  • A narrow passage of the Ape Cave gently curves in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave is 13,042 feet long (3,975 meters), making it the third-longest lava tube in North America. It formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust.
    WA_Ape-Cave_Narrow-Curve_5091.jpg
  • Water that drips into the Ape Cave collects into a stream as it flows through North America’s third-largest lava tube, located in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The cave is 13,042 feet long (3,975 meters) and the rock is porous, allowing rainwater to seep in.
    WA_Ape-Cave_Stream_5105.jpg
  • The Milky Way is visible in the midnight sky over the eastern flank of Mount Rainier in Washington state. The Milky Way is the galaxy that contains our solar system and is comprised of as many as 400 billion stars and 100 billion planets. Its name comes from the appearance of a band of stars that from Earth are so close together that they cannot be distinguished as individual stars with the naked eye. 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. This view was captured from Sunrise in Mount Rainier National Park.
    Rainier_Milky-Way_Sunrise_0095.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
  • 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
  • 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
  • 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
  • Rolling hills in the Temblor Range are covered with a variety of colorful spring wildflowers during a superbloom in the Carrizo Plain National Monument in California. The Carrizo Plain is the largest single native grassland remaining in California and was designated as the Carrizo Plain National Monument in 2001. During superbloom years, an unusually high number of wildflowers blossom at the same time, usually the result of wet winter and spring weather. The seeds may have been dormant for years in the more typically dry desert soil.
    CA_Carrizo-Plain_Temblor-Range_Super...jpg
  • Foxfire is visible on decaying driftwood at midnight on Ruby Beach in Olympic National Park, Washington. Foxfire is a natural phonemonon produced by bioluminescent fungi typically found on rotting bark. The purpose of the glow is unknown, but it may help the fungus attract insects, which then disperse its spores.
    OlympicNP_Ruby-Beach_Night_Foxfire_9...jpg
  • Water that drips into the Ape Cave collects into a stream as it flows through North America’s third-largest lava tube, located in the Mount St. Helens National Volcanic Monument in Washington state. The Ape Cave formed during an eruption of Mount St. Helens approximately 2,000 years ago. An 8-mile-long (13-kilometer-long) lava flow poured down the southern flank of the volcano. Lava cools from the outside-in, so the flow became like a straw, allowing lava to continue to flow through a hardened crust. The cave is 13,042 feet long (3,975 meters) and the rock is porous, allowing rainwater to seep in.
    WA_Ape-Cave_Stream_5104.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
  • 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
  • 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
  • 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 crane fly, with dew drops still on its face and wings, clings to wall barley as the sun rises in Carrizo Plain National Monument in California. The Carrizo Plain National Monument protects the largest remaining native grasslands in California.
    CA_Carrizo-Plain_Crane-Fly_Barley_14...jpg
  • Rolling hills in the Temblor Range are covered with a variety of colorful spring wildflowers during a superbloom in the Carrizo Plain National Monument in California. The Carrizo Plain is the largest single native grassland remaining in California and was designated as the Carrizo Plain National Monument in 2001. During superbloom years, an unusually high number of wildflowers blossom at the same time, usually the result of wet winter and spring weather. The seeds may have been dormant for years in the more typically dry desert soil.
    CA_Carrizo-Plain_Temblor-Range_Super...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
  • Numerous large driftwood logs fill Ruby Beach in Olympic National Park, Washington.
    OlympicNP_Ruby-Beach_Driftwood_9099.jpg
  • Rain water collects in several potholes in the hard, sandstone desert landscape at Tuweep in Grand Canyon National Park, Arizona. Tuckup Point is visible in the background. This image was captured at night; the landscape was lit by the full moon.
    AZ_Tuweep_Tuckup_Potholes_Night_4757.jpg
  • Hundreds of hoodoos that make up the Bryce Canyon amphitheater are lit at sunrise. Bryce Canyon is national park in Utah. The hoodoos, or spires, are remanants of large sandstone fins that have been subjected to centuries of erosion.
    Bryce-Canyon_Amphitheater_Dawn_4388.jpg
  • A layered sandstone wall appears to have been twisted and folded by many thousands of years of geological forces in Harris Wash in Grand Staircase-Escalante National Monument, Utah.
    Grand-Staircase-Escalante_Harris-Was...jpg
  • Some fall color is visible through a light dusting of snow on a hillside that looks out to the Tatoosh Range in Mount Rainier National Park, Washington.
    RainierNP_Tatoosh-Range_Fall-Snow_55...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 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
  • 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
  • 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
  • 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
  • A bull elk (Cervus canadensis) stands along the Madison River in Yellowstone National Park, Wyoming.
    Elk_Yellowstone_Madison-River_Snow_2...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) 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
  • 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) 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
  • 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
  • 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
  • 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 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 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
  • 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
  • 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
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