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  • A great horned owl (Bubo virginianus) sits at the entrance to its nest on a rocky ledge overlooking Montezuma Well in Arizona as its young owlet looks out. Montezuma Well is part of the Montezuma Castle National Monument, which protects ancient cliff dwellings built and used by the Sinagua people between 1100 and 1425 AD.
    Owl-Great-Horned_Nest_Montezuma-Well...jpg
  • An adult male summer tanager (Piranga rubra) rests on a branch in a lush area at the base of Montezuma Well, part of Montezuma Castle National Monument in Arizona. Summer tanagers mainly eat bees and wasps and are typically found high in the forest canopy. The male summer tanager is the only completely red bird in all of North America.
    Tanager_Summer_Montezuma-Well_5462.jpg
  • An Anna's hummingbird (Calypte anna) drinks sap from a well in an elm tree drilled by a red-breasted sapsucker.
    Hummingbird_Sap-Well_Lynnwood_3662.jpg
  • An Anna's hummingbird (Calypte anna) drinks sap from a well in an elm tree drilled by a red-breasted sapsucker.
    Hummingbird_Sap-Well_Lynnwood_3421.jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) reaches into a sap well to feed in Everett, Washington. The red-breasted sapsucker is known for drilling neat rows of shallow holes into trees to collect sap.
    Sapsucker_Red-Breasted_Feeding_Evere...jpg
  • A close-up image of the trunk of an Arizona sycamore (Platanus wrightii) reveals abstract, almost monochromatic patterns of its bark. The Arizona sycamore is native to the states of Arizona and New Mexico. This Arizona sycamore was found in a lush area near Montezuma Well in Montezuma Castle National Monument.
    Sycamore_Arizona_Bark_Detail_Montezu...jpg
  • A close-up image of the trunk of an Arizona sycamore (Platanus wrightii) reveals abstract, almost monochromatic patterns of its bark. The Arizona sycamore is native to the states of Arizona and New Mexico. This Arizona sycamore was found in a lush area near Montezuma Well in Montezuma Castle National Monument.
    Sycamore_Arizona_Bark_Detail_Montezu...jpg
  • A male ornate tree lizard (Urosaurus ornatus) suns itself on a rock in a lush area near Montezuma Well in Montezuma Castle National Monument, Arizona.
    Lizard_Ornate-Tree_Montezuma-Well_55...jpg
  • A ruby-crowned kinglet (Regulus calendula) feeds on an insect attracted to sap accumulating in a well in an elm tree drilled by a red-breasted sapsucker.
    Kinglet-Ruby-Crowned_Elm-Tree_3640.jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) pauses between feeding at sap wells it created at a tree in Everett, Washington. A thread of sap clings to its head. The red-breasted sapsucker is known for drilling neat rows of shallow holes into trees to collect sap.
    Sapsucker_Red-Breasted_Feeding_4035.jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) pauses between drilling holes in a tree in Snohomish County, Washington. The red-breasted sapsucker is known for drilling neat rows of shallow holes into trees to collect sap.
    Sapsucker_Red-Breasted_Trunk_Lynnwoo...jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) pauses between drilling holes in a tree in Snohomish County, Washington. The red-breasted sapsucker is known for drilling neat rows of shallow holes into trees to collect sap.
    Sapsucker_Red-Breasted_Trunk_Lynnwoo...jpg
  • Water from the Pacific Ocean drains through the skylight of a sea cave at Cape Perpetua near Yachats, Oregon. During the year's highest tides or in strong surf, ocean waves splash onto the rocks and make a 360-degree waterfall as the water drains into the hole.
    OR_CapePerpetua_Blowhole_Sunset_4254.jpg
  • Several Joshua Trees (Yucca brevifolia) grow in a carpet of goldfields (Lasthenia chrysotoma) in the Indian Wells Valley, northeast of Mojave California.
    CA_JoshuaTrees_Goldfields_IndianWell...jpg
  • Large sand dunes form near Stovepipe Wells in Death Valley National Park, Califonria. The dunes are surrounded by mountains, though most of the sand is the result of the erosion of the Cottonwood Mountains, which lie to the north and northwest.
    DeathValley_Dunes_Stovepipe.jpg
  • A rock squirrel (Spermophilus variegatus) climbs on mesquite on a cliff overlooking Montezuma Well in Montezuma Castle National Monument near Camp Verde, Arizona. The rock squirrel belongs to the ground squirrel family, although it is known to climb trees and boulders.
    Squirrel-Rock_Mesquite_Montezuma-Wel...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
  • A fox squirrel (Sciurus niger) digs its claws into the bark as it climbs an oak tree in Potholes State Park in Grant County, Washington. The fox squirrel is the largest tree squirrel native to North America, though its original range consisted of the eastern half of the continent. It was introduced to several western states, including Washington, as well as the Canadian province of British Columbia.
    Squirrel-Fox_Climbing_Potholes-SP_86...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
  • A family of four trumpeter swans (Cygnus buccinator) swims in the Firehole River in winter in Yellowstone National Park, Wyoming. The Firehole River is supplied mainly by runoff from geysers and hot springs, so it does not freeze in the winter, even when temperatures plunge well below freezing.
    Swans-Trumpeter_Firehole-River_Winte...jpg
  • A fox squirrel (Sciurus niger) poses on an oak tree branch in Potholes State Park in Grant County, Washington. The fox squirrel is the largest tree squirrel native to North America, though its original range consisted of the eastern half of the continent. It was introduced to several western states, including Washington, as well as the Canadian province of British Columbia.
    Squirrel-Fox_Potholes-SP_8786.jpg
  • A flock of barnacle geese (Branta leucopsis) take flight in wetlands near the town of Höfn, Iceland. Barnacle geese typically use Iceland as a migratory stop as they travel between their wintering grounds in Great Britain and their breeding grounds in Greeland, although growing numbers of the birds are now nesting in Iceland as well.
    Geese-Barnacle_Flock_Hofn-Iceland_37...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 black-tailed prairie dog (Cynomys ludovicianus) feeds on grass in the Rocky Mountain Arsenal National Wildlife Refuge near Denver, Colorado. Black-tailed prairie dogs are native to North American grasslands although their populations are well below historical levels. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Prairie-Dog_Black-Tailed_Rocky-Mount...jpg
  • The Potomac River runs through a gorge in Great Falls Park located on the border of Virginia and Maryland. The northern gorge wall (on the right of this image) as well as the Potomac River are located in Maryland; the southern wall and most of the national park facilities are located in Virginia.
    Great-Falls-Park_Potomac-River_4219.jpg
  • The Genesee River cascades over a drop in the eroded river bed in Letchworth State Park, New York. The area was once submerged under an inland sea, which left deposits that formed sandstone and shale. The Genesee River eroded the river bed, forming small drops like this, as well as the Letchworth Gorge, which is 22 miles (35 km) long and as much as 550 feet (168 meters) deep.
    NY_Letchworth_GeneseeRiver_Curve_889...jpg
  • Viewed from the north, a forest is visible on the high bluffs of Protection Island National Wildlife Refuge in Jefferson County, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_8180.jpg
  • A young harbor seal pup (Phoca vitulina) swims with its mother in Discovery Bay near the Protection Island National Wildlife Refuge in Jefferson County, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    HarborSeals_MotherAndPup_DiscoveryBa...jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5316.jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5437.jpg
  • Harbor seals (Phoca vitulina) and glaucous gulls (Larus hyperboreus) share the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_SealsAndGulls_52...jpg
  • Thousands of monarch butterflies (Danaus plexippus) rest in a tree in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Cluster_Dawn_PacificGrove_08...jpg
  • An American bison (Bison bison) runs in the snow near Junction Butte in Yellowstone National Park, Wyoming. Bison are well equipped for harsh winter conditions. They grow a winter coat of woolly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_5292.jpg
  • A fox squirrel (Sciurus niger) feasts on an acorn from its perch in an oak tree in Potholes State Park in Grant County, Washington. The fox squirrel is the largest tree squirrel native to North America, though its original range consisted of the eastern half of the continent. It was introduced to several western states, including Washington, as well as the Canadian province of British Columbia.
    Squirrel-Fox_Eating_Potholes-SP_8596.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
  • The Potomac River runs through a gorge in Great Falls Park located on the border of Virginia and Maryland. The northern gorge wall (at the top of this image) as well as the Potomac River are located in Maryland; the southern wall and most of the national park facilities are located in Virginia.
    Great-Falls-Park_Potomac-River_4196.jpg
  • The Snonomish River spilled well beyond its banks during a severe flood, engulfing these three trees near Snohomish, Washington.
    Snohomish-River_Flood_Three-Trunks_9...jpg
  • This view of the southwestern side of Protection Island shows the erosion that has been reudcing the size of the island, located in Jefferson County, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_8257.jpg
  • A group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_8223.jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5262.jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0744.jpg
  • The full moon shines over the Conata Basin, located in Badlands National Park, South Dakota. Badlands National Park protects nearly 250,000 acres of sharply eroded buttes, pinnacles, and spires, as well as the largest protected mixed grass prairie in the United States.
    Badlands_ConataBasin_FullMoon_1673.jpg
  • A large granite arch frames a pinyon pine as well as several prominent City of Rocks features, including Elephant Rock (at left) and the Bread Loaves (at right). This arch is part of Window Rock in the City of Rocks National Reserve in southern Idaho.
    Idaho_CityOfRocks_Arch_Sunrise_0993.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 paraglider flies from the summit of Stawamus Chief, a 702 meter (2,303 foot) granite dome near Squamish, British Columbia, Canada. Geologists believe Stawamus Chief is a remnant of a magma chamber that was once well below the Earth's surface. Slow moving molten magma cooled and turned into granite deep below the surface and was gradually exposed by erosion over tens of millions of years. The peak is popular with rock climbers and paragliders.
    BC_StawamusChief_Paraglider_5462.jpg
  • Stawamus Chief, a 702 meter (2,303 foot) granite dome, towers over the nearby town of Squamish, British Columbia, Canada. Geologists believe Stawamus Chief is a remnant of a magma chamber that was once well below the Earth's surface. Slow moving molten magma cooled and turned into granite deep below the surface and was gradually exposed by erosion over tens of millions of years.
    BC_StawamusChief_5485.jpg
  • Brittlebush (Encelia farinosa) grows in a dry valley on the eastern side of Lassen Volcanic National Park, California. The wildflower typically blooms from March until May and is common in the Mojave and Colorado deserts as well as dry interior valleys in California.
    Brittlebush_Lassen_5815.jpg
  • As night falls, an elf owl (Micrathene whitneyi) hunts from a perch in the woods of Miller Canyon at the base of the Huachuca Mountains in southern Arizona. The elf owl is the smallest owl in the Sonoran Desert, about the size of a sparrow and weighing just 1.4 ounces. The owl can see well in low light, but can catch prey in complete darkness by pinpointing it with its ears. The elf owl feeds primarily on invertebrates, such as moths, crickets, scorpions, centipedes and beetles.
    Owl-Elf_Night_Miller-Canyon_7081.jpg
  • Two black-tailed prairie dogs (Cynomys ludovicianus) meet at the entrance to a burrow in the Rocky Mountain Arsenal National Wildlife Refuge near Denver, Colorado. Black-tailed prairie dogs are native to North American grasslands although their populations are well below historical levels. Rocky Mountain Arsenal National Wildlife Refuge was established in 1992 on the site of a former U.S. Army chemical weapons manufacturing facility.
    Prairie-Dogs_Black-Tailed_Rocky-Moun...jpg
  • A fox squirrel (Sciurus niger) looks out from its perch high in an oak tree in Potholes State Park in Grant County, Washington. The fox squirrel is the largest tree squirrel native to North America, though its original range consisted of the eastern half of the continent. It was introduced to several western states, including Washington, as well as the Canadian province of British Columbia.
    Squirrel-Fox_Potholes-SP_8560.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
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5399.jpg
  • A sign on the Icelandic island of Grímsey marks the location of the Arctic Circle, as well as the distances to major world cities. Grímsey is the northernmost point in Iceland and approximately half the island lies within the Arctic Circle.
    Iceland_Grimsey_ArcticCircleMarker_7...jpg
  • A fox squirrel (Sciurus niger) looks out from its perch high in an oak tree in Potholes State Park in Grant County, Washington. The fox squirrel is the largest tree squirrel native to North America, though its original range consisted of the eastern half of the continent. It was introduced to several western states, including Washington, as well as the Canadian province of British Columbia.
    Squirrel-Fox_Potholes-SP_8818.jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0860.jpg
  • Monarch butterflies (Danaus plexippus) cluster together in Pacific Grove, California. The flight muscles of a monarch butterfly do not work well unless the temperature is above 55 degrees Fahrenheit (13 Celsius), so during the winter they cluster in large masses to conserve heat.
    Monarch_Clusters_PacificGrove_0873.jpg
  • An American dipper (Cinclus mexicanus) feeds in the Cedar River near Renton, Washington. American dippers are found throughout western North America, feeding in fast-moving, rocky streams where they feed on aquatic insects and their larvae, tiny fish, and tadpoles. Dippers have an extra eyelid that allow them to see when their heads are underwater as well as scales that close their nostrils when they are submerged.
    Dipper_American_CedarRiver_3872.jpg
  • The Genesee River cascades over a drop in the eroded river bed in Letchworth State Park, New York. The area was once submerged under an inland sea, which left deposits that formed sandstone and shale. The Genesee River eroded the river bed, forming small drops like this, as well as the Letchworth Gorge, which is 22 miles (35 km) long and as much as 550 feet (168 meters) deep.
    NY_Letchworth_GeneseeRiver_Curve_890...jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5369.jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5422.jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5606.jpg
  • A large group of harbor seals (Phoca vitulina), including many young pups, rest on the beach of Protection Island National Wildlife Refuge near Port Townsend, Washington as hundreds of gulls fly in the background. Protection Island, located at the mouth of Discovery Bay in the Strait of Juan de Fuca, is a 364-acre island that serves as pupping grounds for hundreds of harbor seals as well as a summer home for 72 percent of the seabirds that nest in the Puget Sound area.
    WA_ProtectionIsland_HarborSeals_5552.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
  • An anhinga (Anhinga anhinga) dries its wings near a large pond in the Florida Everglades. The anhinga's feathers do not have protective oils for waterproofing like other birds. That lack of oil allows the anhinga to dive deep for fish, however, it must dry its wings after entering the water in order to fly well..
    Anhinga_DryingWings_3144.jpg
  • A large moose (Alces alces) feeds on shrubs in the snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose, which are known as elk in Eurasia, have thick skin and other features that make them well-adapted for cold weather.
    Moose_Snow_Feeding_Yellowstone_0963.jpg
  • A large moose (Alces alces) browses for shrubs in the snow near Pebble Creek in Yellowstone National Park, Wyoming. Moose, which are known as elk in Eurasia, have thick skin and other features that make them well-adapted for cold weather.
    Moose_Snow_Yellowstone_9875.jpg
  • A 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
  • 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
  • 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 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_Yellowstone_0729.jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) pauses to feed on a wasp that was attracted to the sap oozing from the holes it drilled in an elm tree in Snohomish County, Washington. Sapsuckers drill rows of neat wells in tree bark to collect sap, though they also feed on insects and berries. Other birds, especially hummingbirds, and insects are also drawn to the sap wells.
    Sapsucker_Red-Breasted_Wasp_Lynnwood...jpg
  • A red-breasted sapsucker (Sphyrapicus ruber) takes a break from drilling sap wells in an elm tree to stretch its wings.
    Sapsucker_Red-Breasted_Stretching_Ly...jpg
  • The North Fork of the Nooksack River drops 88 feet (27 meters) at Nooksack Falls, located in Washington's North Cascades. Wells Creek is visible between the tree trunks on the right side of the image; it joins the north fork of the Nooksack River just below Nooksack Falls.
    NooksackFalls_WideView_5180.jpg
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