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  • 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
  • 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
  • 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
  • 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 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
  • 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
  • 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
  • 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
  • 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_30...jpg
  • A three-year-old bald eagle (Haliaeetus leucocephalus) rests along the Squamish River in Brackendale, British Columbia, Canada. Bald eagles do not get their identifying white heads until they are four or five years old. The youngest bald eagles have dark heads. A faint eye stripe appears when they are two. That eye stripe is more pronounced in a three-year-old eagle.
    BaldEagle_Age3_Brackendale_4419.jpg
  • Several old growth trees, including western red cedar, stand above Woodard Bay near Olympia, Washington on a foggy morning.
    WA_WoodardBay_FoggyForest_6683.jpg
  • Several ancient trees, each several hundred years old, stand in the Grove of the Patriarchs, a section of very old forest in Mount Rainier National Park, Washington.
    GroveOfThePatriarchs_4266.jpg
  • Heavy moss hangs from four old-growth sitka spruce (Picea sitchensis) trees in the Hoh Rain Forest in Olympic National Park, Washington. The Hoh Rain Forest is one of the largest temperate rain forests in the United States. The sitka spruce trees can grow to be 300 feet (100 meters) tall, with a diameter of 16 feet (5 meters). Trees in the Hoh Rain Forest can grow to tremendous size as the area receives an average of 150 inches (4 meters) of rain annually.
    OlympicNP_Hoh_FourMossyTrees_2269.jpg
  • Several giant sequoia trees (Sequoiadendron gigantea) grow in the Mariposa Grove in Yosemite National Park, California. The grove is home to many ancient trees, one of which is 1800 years old.
    Yosemite_Sequoia_0789.jpg
  • Two oak trees — one young and vibrant, the other old and weathered — stand at the top of a hill in the foothills of Mount Diablo near Clayton, California.
    CA_Clayton_TreesOnHillside_1435.jpg
  • Lichen grows on an old-growth western red cedar tree in the Sol Duc area of Olympic National Park, Washington. Lichens, which are compound organisms consisting of a fungus and a photosynthetic patner, are found in some of the most extreme environments on Earth, as well as rain forests and temperate woodland.
    OlympicNP_LichenOnBark_7082.jpg
  • Mount Rainier, lit by the setting sun, is framed by old-growth trees along the Wonderland Trail in Mount Rainier National Park, Washington.
    Rainier_MowichOldGrowth_6114.jpg
  • This is the view inside a 2,000-year-old Western Red Cedar tree, still living in the Quinault Rain Forest, Washington. As cedar trees age, they hollow out to allow fierce winds to blow through them, rather than toppling during storms. The only living part is a vein that's two feet in diameter. The tree, located in Olympic National Park, however, is so huge another tree grows out of its top.
    QuinaultGiantCedar.jpg
  • Three very large old-growth trees overlook the Ohanapecosh River in the Grove of the Patriarchs in Mount Rainier National Park, Washington.
    Grove_Patriarchs_1738.jpg
  • A battered sockeye salmon (Oncorhynchus nerka) displaying its breeding coloration fights its way up the Cedar River in Renton, Washington, on its way to spawn. Sockeye salmon are also known as blueback salmon, as they are blue tinged with silver while they live in the ocean; they turn red once they return to their freshwater spawning grounds.
    Salmon_Sockeye_Underwater_Renton_113...jpg
  • A bright rainbow falls on the roof of the Cunningham Cabin, a historic feature of the Grand Teton National Park in Wyoming. The cabin was build in 1890 by Pierce and Margaret Cunningham as part of a 160 acre homestead.
    CunninghamCabin.jpg
  • Two fallen Douglas Fir trees rest on a steep hillside overlooking Smallpox Bay on San Juan Island, Washington.
    WA_San-Juan-Island_Downed-Trees_Bay_...jpg
  • A barred owl (Strix varia) rests on its nest in a decaying tree in Interlaken Park, Seattle, Washington. Barred owls nest in existing tree cavities or use abandoned nesting platforms.
    Owl_Barred_OnNest_Interlaken_3112.jpg
  • A barred owl (Strix varia) rests on its nest in a decaying tree in Interlaken Park, Seattle, Washington. Barred owls nest in existing tree cavities or use abandoned platform nests.
    Owl_Barred_OnNest_Interlaken_3205.jpg
  • An adult barred owl (Strix varia) cuddles with one of its owlets in its nest in Interlaken Park, Seattle, Washington. Barred owls typically nest in natural cavities that form in decaying trees.
    Owl_Barred_ParentOwletNest_Interlake...jpg
  • A barred owl (Strix varia) rests on its nest in a decaying tree in Interlaken Park, Seattle, Washington. Barred owls nest in existing tree cavities or use abandoned platform nests.
    Owl_Barred_OnNest_Interlaken_2321.jpg
  • A battered sockeye salmon (Oncorhynchus nerka) displaying its breeding coloration fights its way up the Cedar River in Renton, Washington, on its way to spawn. Sockeye salmon are also known as blueback salmon, as they are blue tinged with silver while they live in the ocean; they turn red once they return to their freshwater spawning grounds.
    Salmon_Sockeye_Underwater_Renton_115...jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) gets ready for its first flight by testing its wings and hopping from branch to branch about 20 feet from its nest in a tall Douglas Fir tree in Kirkland, Washington. At the time of this image, the young eagle was about 10 weeks old.
    BaldEagle_Juvenile_Branching_6433.jpg
  • An osprey (Pandion haliaetus) delivers a fish to its nesting mate on an old piling off Jetty Island in Everett, Washington. Osprey find their prey by hovering over water, then plunging head and feet first. Barbed pads on their feet help them grip slippery fish.
    Osprey_Nesting_Fish_6888.jpg
  • Hundreds of Vaux's swifts (Chaetura vauxi) circle then dive into the chimney at the Wagner Center in Monroe, Washington, during their fall migration. Vaux's swifts do not have back talons, so they cannot stand or perch. They roost by clinging to rough surfaces, mainly old-growth trees, but also old chimneys and smoke stacks that do not have smooth interior liners. As many as 26,000 Vaux's swifts have perched in the Monroe chimney at a time.
    Swifts_Vauxs_Chimney_Monroe_Motion_9...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
  • Mount Baker, a 10,781 foot (3,286 meter) volcano located in Whatcom County, Washington state, takes on a pastel appearance through morning fog near Artist Point in the North Cascades. Mount Baker, which is part of the Cascade Range of mountains, has the second-most thermally active crater in the range, second only to Mount St. Helens. Baker's volcanic cone is relatively young, possibly less than 100,000 years old, even though the area where it sits has been volcanically active for 1.5 million years.
    Baker_PastelFog_ArtistPoint_0691.jpg
  • A subadult bald eagle (Haliaeetus leucocephalus) flies against a blue sky over Ocean Shores, Washington. Bald eagles don't typically earn their pure white heads and tails until they are 4 or 5 years old.
    BaldEagle_SubadultFlying_OceanShores...jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) that is about three months old calls out to its sibling from its perch in a tree.
    BaldEagle_Juvenile_CallingOut_9217.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) sits on a branch over its nest. Nearly eight weeks old, this eaglet repeatedly climbed to this branch and then jumped down and glided into the nest, several feet below. A little over one week later, this eaglet made its first flight.
    BaldEagle_Eaglet_BranchAboveNest_434...jpg
  • A pronghorn (Antilocapra americana) walks on a snow-dusted hill in Yellowstone National Park, Montana. They are often mistakenly referred to as antelope, although they are more closely related to giraffes than to Old World antelope.
    Pronghorn_Winter_Yellowstone_3328.jpg
  • Several layers of leaves frame the trunk of an old maple tree in Hamlin Park, Shoreline, Washington.
    Tree-Maple_Leaves_Hamlin-Park_2810.jpg
  • Hundreds of Vaux's swifts (Chaetura vauxi) circle then dive into the chimney at the Wagner Center in Monroe, Washington, during their fall migration. Vaux's swifts do not have back talons, so they cannot stand or perch. They roost by clinging to rough surfaces, mainly old-growth trees, but also old chimneys and smoke stacks that do not have smooth interior liners. As many as 26,000 Vaux's swifts have perched in the Monroe chimney at a time.
    Swifts_Vauxs_Chimney_Monroe_Motion_9...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
  • An American crow (Corvus brachyrhynchos) calls out from its perch on an old stump in the Edmonds Marsh, Edmonds, Washington.
    Crow_Cawing_Edmonds-Marsh_0610.jpg
  • A long exposure captures the motion of Pacific Ocean waves crashing through the Hōlei Sea Arch in Volcanoes National Park, Hawai`i. The Hōlei Sea Arch is about 90 feet (27 meters) tall and quite young. The erosive force of the waves created the arch within the past 100 years. The lava cliff itself is only about 550 years old. Hōlei is the name for a small plant in the milkweed family.
    HI_Volcanoes_Holei-Sea-Arch_9022.jpg
  • A young female moose (Alces alces), approximately one month old, feeds with her mother in a forested area in the Cascades of Washington state. Moose are part of the deer family; they are known as moose in North America and as elk in Europe and Asia.
    Moose_Mother-Calf_Feeding_4276.jpg
  • Mount Baker, a 10,781 foot (3,286 meter) volcano located in Whatcom County, Washington state, is partially reflected in a mountain tarn near Artist Point in the North Cascades. Mount Baker, which is part of the Cascade Range of mountains, has the second-most thermally active crater in the range, second only to Mount St. Helens. Baker's volcanic cone is relatively young, possibly less than 100,000 years old, even though the area where it sits has been volcanically active for 1.5 million years.
    Baker_Tarn_ArtistPoint_0712.jpg
  • A bald eagle (Haliaeetus leucocephalus), likely 4 years old, dives in hopes of catching a fish in Hood Canal near Seabeck, Washington. Bald eagles don't receive their pure white head until they are 4 to 5 years old.
    BaldEagle_Diving_NearlyAdult_HoodCan...jpg
  • Two juvenile bald eagles (Haliaeetus leucocephalus) sit together on their nest in Puyallup, Washington. While young bald eagles are nearly as big as their parents by the time they are two months old, they do not develop their distinctive white heads until they are four or five years old.
    BaldEagles_JuvenilesOnNest_Puyallup_...jpg
  • Red rock lines a large volcanic crater, one of many in an area known as Diamond Craters in southeastern Oregon. The area contains dozens of basaltic lava flows, cinder cones, and maars ranging in age from 6,000 to 60,000 years old.
    OR_DiamondCraters_3438.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) that is approximately two years old chases a mature bald eagle over Boundary Bay in British Columbia, Canada. Bald eagles do not receive their distinctive white heads until they are four or five years old.
    BaldEagles_JuvenileChasingAdult_Boun...jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) comes in for a landing. At the time of this image, the young eagle was a little over three months old and had been flying for about one month.
    BaldEagle_Juvenile_Landing_1210.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus), about two and a half months old, takes off from a tree near its nest. At the time of this image, the bald eagle fledgling had been flying for about two weeks.
    BaldEagle_Juvenile_TakingOff_9041.jpg
  • Two juvenile bald eagles (Haliaeetus leucocephalus), just over two months old, sit together on a branch a few hundred yards away from their nest. At the time of this image, the fledglings had been flying for less than a week.
    BaldEagle_Juveniles_TwoOnBranch_8277.jpg
  • A developmental feather from a very young bald eage (Haliaeetus leucocephalus) lies on the ground beneath the eaglet's nest. The eaglet that this feather was from began flying shortly after it was two months old. This was one of the last developmental feathers before it flew.
    BaldEagle_Eaglet_Feather_5832.jpg
  • Two juvenile bald eagles (Haliaeetus leucocephalus), approximately seven weeks old, sit together on their nest in Heritage Park, Kirkland, Washington. At this stage of development, both birds would regularly take turns testing their wings and sitting on the edge of the next, but it was another two weeks before they took their first flights.
    BaldEagle_Eaglets_Nest_Together_3567.jpg
  • An arctic fox (Vulpes lagopus) in transition from its winter to summer coat walks across on old lava field on Iceland's Snæfellsnes peninsula. Arctic foxes have limbs, snouts and ears that are shorter than average, a feature that minimizes heat loss and the risk of frostbite. The pads of their feet are also covered in fur. Arctic foxes are primarily nocturnal; this fox was photographed shortly after midnight.
    Iceland_ArcticFox_7346.jpg
  • A bald eagle chick (Haliaeetus leucocephalus) that is just over one month old looks over the edge of the nest. The juvenile eagle spent several more weeks flapping its wings inside the nest before it took its first flight.
    BaldEagle_Chick_NestEdge_1584.jpg
  • Two bald eagle chicks, estimated to be about a week and a half old, share a nest. The eaglets are in the process of replacing their natal down with thermal down, a process that begins at about 10 days of age. They are hatched with natal down, a light-colored down that has little insulating ability. After its replaced with thermal down, which occurs at about 15 days of age, the eaglets are able to regulate their body temperature on their own.
    BaldEagle_Chicks_NatalDown_9652.jpg
  • Pacific Ocean waves crash into a narrow inlet in an old lava flow near Princeville on the Hawaiian island of Kauai.
    kauai-inlet-princeville.jpg
  • A glassy iceberg comprised of ice believed to be more than 1,500 years old floats in Jökulsárlón, the glacier lagoon in southern Iceland. The oldest ice in the lagoon is almost like glass. Over time, the weight of ice and snow on top of it presses out any air. Without the obstruction of air pockets, blue wavelengths of light are able to penetrate deep into the iceberg, resulting in the blue color.
    Iceland_Jokulsarlon_9421.jpg
  • A window melts through a huge iceberg in Jökulsárlón, a glacial lagoon located in southern Iceland. Some of the ice in the lagoon is 1,500 years old. Over time, air has been pressed out of the ice, resulting in the blue color. Without air to reflect it, blue light is able to penetrate deep into the ice.
    Iceland_Jokulsarlon_9265.jpg
  • The Guadalupe Mountains of western Texas tower over the Salt Basin, a remnant of an ancient lake that existed during the Pleistocene Epoch between 10,000 and 1.8 million years ago. The lake, which at times was up to 37 feet deep, had no outlet. As the water evaporated, salt and gypsum accumulated. The old lake bed is now dry most of the year, collecting only an inch or so of water during exceptionally heavy rains. The Guadalupe Mountains, part of Guadalupe Mountains National Park, are visible on the horizon. The iconic El Capitan (8085 feet/2464 meter) is visible at right. Guadalupe Peak, the highest point in Texas at 8749 feet (2667 meters) is immediately left of it.
    TX_GuadalupeMountains_SaltBasin_1250.jpg
  • Ancient Anasazi petroglyphs cover a rock face, known as Atlatl Rock in the Valley of Fire State Park, Nevada. The rock art may be more than 1,500 years old.
    vof_Atlatl-Rock_Petroglyphs_9353.jpg
  • Thousands of Vaux’s swifts (Chaetura vauxi) fly into the chimney at the Wagner Performing Arts Center in Monroe, Washington. As many as 26,000 Vaux’s swifts use the chimney as a roost each night during their spring and fall migrations. Vaux’s swifts do not have back talons, so they cannot stand or perch; when roosting for the night, they cling to rough surfaces, mainly old-growth trees and the inside of old chimneys. They spend their days in flight catching insects and at night roost communally to conserve heat. The migratory roost in Monroe is one of the largest in North America.
    Swifts_Vauxs_Chimney_Monroe_3421.jpg
  • Three old CRT computer monitors are found dumped in the water in a side channel of the Middle Fork Snoqualmie River near North Bend, Washington.
    Garbage_Dumped-Monitors_Snoqulamie_9...jpg
  • This unusual "triple twist tree" growing out of a crack in a lava field at Craters of the Moon National Monument in Idaho helped scientists determine the age of the flow here. The tree has 1,350 rings, so scientists figure the flow here is about 2,000 years old. This flow is the youngest in Craters of the Moon National Monument.
    CratersOfTheMoon_Triple-Twist-Tree_2...jpg
  • Mount Baker, a 10,781 foot (3,286 meter) volcano located in Whatcom County, Washington state, is partially reflected in a mountain tarn near Artist Point in the North Cascades. Mount Baker, which is part of the Cascade Range of mountains, has the second-most thermally active crater in the range, second only to Mount St. Helens. Baker's volcanic cone is relatively young, possibly less than 100,000 years old, even though the area where it sits has been volcanically active for 1.5 million years.
    Baker_Tarn_ArtistPoint_0749.jpg
  • A harbor seal (Phoca vitulina) swims among the towering icebergs in the glacial lagoon, Jökulsárlón, Iceland. The icebergs floating in the lake calved off from the Breiðamerkurjökull glacier with some of the ice being more than 1,000 years old. Jökulsárlón covers an area of about 18 square kilometers (6.9 square miles) and ranks as the deepest lake in Iceland.
    Iceland_Jokulsarlon_Seal_3631.jpg
  • A young bald eagle (Haliaeetus leucocephalus) feeds on a midshipman fish that it caught in the Hood Canal near Seabeck, Washington. Hundreds of bald eagles congregate in the area early each summer to feast on the migrating fish that gets trapped in oyster beds during low tides. This eagle is likely 4 years old. Bald eagles don't get their pure white heads and tails until they are 5.
    BaldEagle_MidshipmanFish_HoodCanal_4...jpg
  • A young bald eagle (Haliaeetus leucocephalus), approximately four weeks old, looks out from its nest in Heritage Park, Kirkland, Washington.
    BaldEagle_Eaglet_FourWeeks_0404.jpg
  • An adult bald eagle (Haliaeetus leucocephalus) watches the two young eaglets on its nest in Heritage Park, Kirkland, Washington. The young eaglets in this image are approximately two weeks old.
    BaldEagle_Nest_Parent_TwoEaglets_776...jpg
  • A natural nighttime pillar of light known as the Zodiacal Light shines above and is reflected in Crater Lake, Oregon. The Zodiacal Light results from the sun shining on dust particles from old comets. The dust particles - the largest of which are believed to be just 0.3 mm and miles from its nearest neighboring particle - orbit the sun in a range from Mars to beyond Jupiter. Visible year-round in the tropics, the Zodiacal Light is best viewed immediately around the spring and fall solstice farther from the equator. The planet Venus, the brightest object in the sky, is visible near the peak of the Zodiacal Light and is also reflected in Crater Lake. The Milky Way, visible on the right, intersects with the Zodiacal Light at the top-center of the image. Crater Lake, which is actually a caldera, formed when Mount Mazama erupted violently about 7,700 years ago, causing its summit to collapse. Subsequent eruptions sealed the caldera, trapping rain water and snowmelt, forming the lake, which has a maximum depth of 1,949 feet (594 meters). Wizard Island, a volcanic cinder code, is visible in the foreground.
    CraterLake_ZodiacalLight_9909.jpg
  • A cluster of Giant Sequoias (Sequoiadendron giganteum) known as The House grow together in Sequoia National Park, California. Giant Sequoias are the world's largest trees in terms of total volume, with the largest trees reaching 311 feet (95 meters) in height and more than 56 feet (17 meters) in diameter. The oldest Giant Sequoias are more than 3,000 years old. Sequoias are unique in that they can grow close together, sharing root systems, to get the water they need.
    Sequoias_TheHouse_SequoiaNP_8857.jpg
  • The sun shines through a cluster of Giant Sequoias (Sequoiadendron giganteum) known as The House in Sequoia National Park, California. Giant Sequoias are the world's largest trees in terms of total volume, with the largest trees reaching 311 feet (95 meters) in height and more than 56 feet (17 meters) in diameter. The oldest Giant Sequoias are more than 3,000 years old. Sequoias are unique in that they can grow close together, sharing root systems, to get the water they need.
    Sequoias_TheHouse_Sunburst_SequoiaNP...jpg
  • Several seabirds fly over the Atlantic Ocean as the last light of day illuminates Snæfellsjökull, a glacier-covered stratovolcano in western Iceland. Located on the Snæfellsnes peninsula, Snæfellsjökull is 1,446 meters (4,744 feet) tall. Stratovolcanoes, also known as composite volcanoes, are typically cone-shaped and made up of many layers from many volcanic eruptions. Snæfellsjökull is approximately 700,000 years old and is estimated to have last erupted in 200 A.D. Snæfellsjökull is an Icelandic word meaning "snowy mountain glacier."
    Iceland_Snaefellsjokull_Birds_3325.jpg
  • Three snowy owls (Bubo scandiacus formerly Nyctea scandiaca) rest on an old stump along Boundary Bay in southern British Columbia, Canada. The bay, located along border of the United States and Canada, is well south of the typical snowy owl range. Once or twice a decade, owls migrate farther south in an event known as an irruption. Irruptions happen when the snowy owl population is too large for the available food supply on the Arctic tundra.
    SnowyOwls_BoundaryBay_ThreeOnStump_6...jpg
  • A snowy owl (Nyctea scandiaca) rests in an old stump at Damon Point in Ocean Shores, Washington. Snowy owls, which spend the summer in the northern circumpolar region north of 60 degrees latitude, have a typical winter range that includes Alaska, Canada and northern Eurasia. Every several years, for reasons still unexplained, the snowy owls migrate much farther south in an event known as an irruption. One leading theory is that the snowy owl population grew so fast last summer that they have to spread out more than usual to find food this winter. One was reported as far south as Hawaii. During the 2011-2012 irruption, Ocean Shores on the Washington coast was the winter home for an especially large number of snowy owls. Snowy owls tend to prefer coastal and plains areas, which most resemble the open tundra that serves as their typical home. Snowy owls, like other owls, hunt at night and rest during the day to conserve energy.
    SnowyOwl_OceanShores_Resting_Stump_3...jpg
  • A bald eagle (Haliaeetus leucocephalus) fledgling flies from its nest. At the time of this image, the juvenile eagle was less than three months old and had been flying for about two weeks.
    BaldEagle_Juvenile_Flying_9514.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) exercises its wings by tightly grabbing a branch with its talons and flapping its wings. The fledgling's motion is blurred by a long exposure. At the time of this image, the young eagle was about two and a half months old and had been flying for a little over a week.
    BaldEagle_Juvenile_FlappingWings_Mot...jpg
  • One juvenile bald eagle (Haliaeetus leucocephalus) feeds at the nest while its sibling is forced to wait in the shadow for its turn. The young eagles were about two and a half months old at the time this image was taken and both had been flying for a couple weeks. One of the parents would deliver food to the nest while the young eagles were away and they would race back to the nest to feed. The dominant eagle arrived first and prevented the other juvenile from feeding.
    BaldEagle_Juvenile_FeedingAtNest_878...jpg
  • A bald eagle chick (Haliaeetus leucocephalus) that is just over one month old tests its wings while sitting on the nest. It spent several more weeks flapping its wings on the nest, standing at the edge of the nest, and climbing onto branches before it made its first flight.
    BaldEagle_Chick_TestingWings_1561.jpg
  • A bald eagle chick (Haliaeetus leucocephalus) that is about one month old approaches its parent on their nest in Heritage Park, Kirkland, Washington.
    BaldEagles_Parent_Chick_Nest_0598.jpg
  • A bald eagle chick (Haliaeetus leucocephalus), estimated to be about 10 days old, flaps one of its wings in its nest in Heritage Park, Kirkland, Washington. Eaglets are hatched with a coat of light-colored natal down, which has little insulating ability. After 10 days, the natal down begins to be replaced by thermal down. That transition is beginning to take place with this chick. Its wings and chest are covered with thermal down; its head and back are still covered with natal down. The change is typically complete by age 15 days, when the eaglets are able to regulate their body temperature on their own.
    BaldEagle_Chick_NatalDown_9544.jpg
  • An osprey (Pandion haliaetus) delivers a fish to its nesting mate on an old piling off Jetty Island in Everett, Washington. Osprey find their prey by hovering over water, then plunging head and feet first. Barbed pads on their feet help them grip slippery fish.
    Osprey_Nesting_Fish_6889.jpg
  • A mallard duck (Anas platyrhynchos) watches over one of her ducklings, which is less than a week old, in the wetlands of the Washington Park Arboretum in Seattle, Washington.
    Mallard_MotherAndDuckling_3008v.jpg
  • A Desert Tortoise (Gopherus agassizii) makes a rare appearance above ground to munch on wildflowers. Desert tortoises spend roughly nine months a year in burrows 10 feet underground, living off stored moisture from the flowers they consume. This tortoise, approximately 20 years old, is from a preserve in the Mojave Desert near California City, California.
    DesertTortoiseFeeding.jpg
  • New leaves form on a Youth on Age (Tolmiea menziesii) plant. The plant is named for the fact that new leaves — and sometimes new plants — form at the base of old leaves. It is also known by the names Piggyback Plant and Thousand Mothers.
    YouthOnAge_0500.jpg
  • New leaves form on a Youth on Age (Tolmiea menziesii) plant. The plant is named for the fact that new leaves — and sometimes new plants — form at the base of old leaves. It is also known by the names Piggyback Plant and Thousand Mothers.
    YouthOnAge_0496.jpg
  • Ancient Anasazi petroglyphs cover a rock face, known as Atlatl Rock in the Valley of Fire State Park, Nevada. The rock art may be more than 1,500 years old. The rock is named for the two symbols at the top, immediately below the bighorn sheep. The object below the sheep is the atlatl and the object just below that is the dart. An atlatl is a hunting device that is also sometimes called a spear thrower.
    vof-atlatl-rock-9350.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
  • The setting sun shines through the arms of a saguaro (Carnegiea gigantea) cactus in Saguaro National Park, Arizona. Saguaros can live for 150 years and generally don't grow their first arms until they are 75-100 years old.
    Saguaro-NP_Saguaro_Sunset_2390.jpg
  • Hundreds of Vaux's swifts (Chaetura vauxi) gather at dusk before roosting in the chimney at the Wagner Center in Monroe, Washington, during their fall migration. Vaux's swifts do not have back talons, so they cannot stand or perch. They roost by clinging to rough surfaces, mainly old-growth trees, but also old chimneys and smoke stacks that do not have smooth interior liners.
    Swifts_Vauxs_Flock_Monroe_3224.jpg
  • Roots from an old tree, submerged for 100 years in Rattlesnake Lake near North Bend, Washington, reach out of the cracking mud exposed after a prolonged drought.
    Rattlesnake-Lake_Exposed-Tree-Roots_...jpg
  • The setting sun reddens the southwestern face of Mount Baker, a 10,781 foot (3,286 meter) volcano located in Whatcom County, Washington state. Mount Baker, which is part of the Cascade Range of mountains, has the second-most thermally active crater in the range, second only to Mount St. Helens. Baker's volcanic cone is relatively young, possibly less than 100,000 years old, even though the area where it sits has been volcanically active for 1.5 million years.
    Baker_Sunset_FromFirIsland_6449.jpg
  • The Milky Way shines over the icebergs floating in Jökulsárlón, the glacial lagoon in southeast Iceland. The icebergs floating in the lake calved off from the Breiðamerkurjökull glacier with some of the ice being more than 1,000 years old. Jökulsárlón covers an area of about 18 square kilometers (6.9 square miles) and ranks as the deepest lake in Iceland.
    Iceland_Jokulsarlon_MilkyWay_3427.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) that recently fledged looks back at its nest in Heritage Park, Kirkland, Washington. The young eagle, approximately 12 weeks old, made its first flight a few days before this image was captured. Down and developmental feathers are visible on the nest and branches of the tree.
    BaldEagle_Juvenile_LookingAtNest_800...jpg
  • A bald eagle (Haliaeetus leucocephalus) breaks off a morsel of food and feeds it to one of its eaglets on its nest in Kirkland, Washington. The young eaglet is approximately five weeks old in this image.
    BaldEagle_FeedingJuvenile_2489.jpg
  • A snowy owl (Nyctea scandiaca) stretches while resting in an old stump at Damon Point in Ocean Shores, Washington. Snowy owls, which spend the summer in the northern circumpolar region north of 60 degrees latitude, have a typical winter range that includes Alaska, Canada and northern Eurasia. Every several years, for reasons still unexplained, the snowy owls migrate much farther south in an event known as an irruption. During one irruption, a snowy owl was found as far south as the Caribbean. During the 2011-2012 irruption, Ocean Shores on the Washington coast was the winter home for an especially large number of snowy owls. Snowy owls tend to prefer coastal and plains areas, which most resemble the open tundra that serves as their typical home.
    SnowyOwl_OceanShores_Stretching_Stum...jpg
  • With a three-quarters moon as a backdrop, a bald eagle fledgling (Haliaeetus leucocephalus) calls out from the top of a Douglas fir tree. At the time of this image, this juvenile bald eagle was approximately three months old.
    BaldEagle_Fledgling_Moon_9358.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus) prepares to take off from a branch while its sibling looks on. At the time of this image, these fledglings, a little over two months old, had been flying for less than one week.
    BaldEagle_Juveniles_TwoOnBranch_8287.jpg
  • A juvenile bald eagle (Haliaeetus leucocephalus), approximately seven weeks old, adjusts its flight feathers from the edge of its nest. Less than two weeks later, this eaglet made its first flight.
    BaldEagle_Eaglet_AdjustFeathers_3975.jpg
  • A young bald eagle (Haliaeetus leucocephalus), approximately six weeks of age, begins to outgrow its nest. The bald eagle chick spent three more weeks sitting on the edge of the nest and testing its wings before it took its first flight.
    BaldEagle_Eaglet_SixWeeks_3372.jpg
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