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  • The sun breaks through the clouds, illuminating the early autumn forest surrounding Kettle Pond in this view from the summit of Owl's Head Mountain in the Groton State Forest, Vermont. Owl's Head Mountain has an elevation of 1958 feet (597 meters). Hardwood Mountain, with an elevation of 2,172 feet (662 meters) is visible to the left of Kettle Pond. The White Mountains of New Hampshire are visible at the horizon in the background.
    VT_Owls-Head-Mountain_Autumn_1378.jpg
  • An extreme macro view — five times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — approximately five times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head as faint abstract lines against a backdrop of green grass.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — approximately three times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — five times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — five times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — approximately three times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — five times life size — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • An extreme macro view — five times life size — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • Golden light of the evening sun warms the colors of Reservation Head and reflects onto the water of Deception Pass in this view from Deception Pass State Park in Washington state. The pass is the dividing line between Skagit and Whatcom counties. Deception Pass was named by Captain George Vancouver in 1772 to reflect his disappointment that the waterway was more narrow than it first appeared.
    WA_Deception-Pass_Reservation-Head_9...jpg
  • An extreme macro view — five times magnification — renders the pappus of a common dandelion (Taraxacum officinale) seed head in abstract forms.
    Dandelion_Seed-Head_Macro_Abstract_0...jpg
  • A common dandelion (Taraxacum officinale) seed head stands among tall blades of grass in a yard in Snohomish County, Washington.
    Dandelion_Seed-Head_Grass_Lynnwood_2...jpg
  • A common dandelion (Taraxacum officinale) seed head is visible in front of the flower of another dandelion.
    Dandelion_Seed-Head_Lynnwood_2449.jpg
  • A bald eagle (Haliaeetus leucocephalus) turns its head to look for fish as it soars over Hood Canal near Seabeck, Washington.
    Bald-Eagle_Hood-Canal_Soaring_7711.jpg
  • Two black-headed gulls (Larus ridibundus) mate on the frozen Lake Mývatn in northern Iceland. The gull is the smallest gull that breeds in Iceland. This image sequence shows the female waiting for a mate, the gulls singing to each other, and fertalization.
    BlackHeadedGullsMating.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately five times life size.
    Dandelion_Flower_Macro_2734.jpg
  • A hoary marmot (Marmota caligata) poses for a close-up photo in Mount Rainier National Park, Washington. Marmots, which hibernate for 8-9 months a year, live near the tree line and feast on wildflowers and grasses during the summer months.
    Marmot-Hoary_Profile_RainierNP_3784.jpg
  • An Atlantic Puffin (Fratercula arctica) cries out from its perch on a grassy bluff in Látrabjarg, Iceland. Atlantic Puffins are known for their colorful bills, which are especially colorful during the breeding season. About 60 percent of all Atlantic Puffins nest in Iceland.
    Puffin_Latrabjarg_CryingOut_5000.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately five times life size.
    Dandelion_Flower_Macro_2742.jpg
  • A dandelion (Taraxacum officinale) seedhead stands among blades of grass in Snohomish County, Washington. Each of the flower's seeds is attached to a feathery parachute called a pappus, which allows the wind to carry the seeds great distances.
    Dandelion_Seedhead_Lynnwood_8557.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately five times life size.
    Dandelion_Flower_Macro_2696.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately five times life size.
    Dandelion_Flower_Macro_2710.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately two times life size.
    Dandelion_Flower_Macro_2414.jpg
  • An Atlantic Puffin (Fratercula arctica) looks out from its perch on a grassy bluff in Látrabjarg, Iceland. Atlantic Puffins are known for their colorful bills, which are especially colorful during the breeding season. About 60 percent of all Atlantic Puffins nest in Iceland.
    Puffin_Latrabjarg_Portrait_5068.jpg
  • An Atlantic Puffin (Fratercula arctica) looks out from its perch on a grassy bluff in Látrabjarg, Iceland. Atlantic Puffins are known for their colorful bills, which are especially colorful during the breeding season. About 60 percent of all Atlantic Puffins nest in Iceland.
    Puffin_Latrabjarg_CloseUp_4603.jpg
  • The petals, or rays, of a common dandelion (Taraxacum officinale) form abstract patterns in this macro view, which is approximately three times life size.
    Dandelion_Flower_Macro_1841.jpg
  • An Atlantic Puffin (Fratercula arctica) looks out from its perch atop the Látrabjarg, Iceland, bird cliff. Atlantic Puffins are known for their colorful bills, which are especially colorful during the breeding season. About 60 percent of all Atlantic Puffins nest in Iceland.
    Puffin_Latrabjarg_Portrait_6403.jpg
  • An Atlantic Puffin (Fratercula arctica) looks out from its perch atop the Látrabjarg, Iceland, bird cliff. Atlantic Puffins are known for their colorful bills, which are especially colorful during the breeding season. About 60 percent of all Atlantic Puffins nest in Iceland.
    Puffin_Latrabjarg_Portrait_5695.jpg
  • The sun rises over the Catlins Heads near Owaka in southeastern New Zealand.
    NZ_CatlinsHeads_Sunrise_8429.jpg
  • Pacific Ocean waves pound the rugged coast at the Catlins Heads near Owaka, New Zealand.
    NZ_CatlinsHeads_8439.jpg
  • A double-crested cormorant (Phalacrocorax auritus) shakes its head dry after fishing in Puget Sound near Edmonds, Washington.
    Cormorant-Double-Crested_Shaking-Hea...jpg
  • A short-eared owl (Asio flammeus) turns its head as it flies over a field on Leque Island near Stanwood, Washington. The short-eared owl is found over much of North America. It hunts over open fields and grasslands, diving to catch small mammals and birds.
    Owl-Short-Eared_Flying_Awkward_Eide_...jpg
  • A brown pelican (Pelecanus occidentalis) in nonbreeding plumage hunts by diving head-first into the water of the Pacific Ocean in Olympic National Park near La Push, Washington. Pelicans feed mainly on fish they find at or near the surface. They can dive from heights of 50 feet (15 meters) or more, filling their throat pouches once they hit the water. They then strain out the water and swallow any food that was caught.
    Pelican-Brown_OlympicNP_Diving_HeadF...jpg
  • A black-headed gull (Larus ridibundus) lands next to its nesting mate on the Snæfellsnes peninsula in Iceland. It breeds in colonies in large reedbeds or marshes or on islands in lakes, and nests on the ground.
    Gull_BlackHeaded_Nesting_8119.jpg
  • A bald eagle (Haliaeetus leucocephalus) flies in a head-on view against a forest backdrop from along the Nooksack River in Welcome, Washington.
    Bald-Eagle_Flying_Head-On_Nooksack_9...jpg
  • Water pours over the face of a moose (Alces alces) after it lifts while feeding on vegetation in Fishercap Lake in the Many Glacier region of Glacier National Park, Montana.
    Moose_FishercapLake_GlacierNP_0352.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
  • A bald eagle (Haliaeetus leucocephalus) looks down at the trout it caught in Pattison Lake near Lacey, Washington. The scientific name of the bald eagle means sea eagle with a white head. While bald eagles are known to eat birds and small mammals, a number of studies conclude that fish make up 60 percent or more of their diets.
    BaldEagle_Trout_PattisonLake_7506.jpg
  • An Anna's hummingbird (Calypte anna) shows off the iridescent feathers on its head and back while resting on the branch of a rhododenron in Snohomish County, Washington. All hummingbirds have iridescent plumage, which reflects certain wavelengths of light. Several features of the feathers result in the iridescence. Barbules, which are flat in most birds, are angled to form a V shape in hummingbirds. Also, the surface of the barbules is covered with microscopic discs containing tiny air bubbles that amplify certain colors of light and cancel out others.
    Hummingbird_Annas_Branch_8200.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
  • An osprey (Pandion haliaetus) hovers over Puget Sound near Everett, Washington, in search for fish. Osprey, also known as sea hawks or fish eagles, hover over water until they spot fish. They then plunge head and feet first to grab their prey. Barbed pads on their feet prevent slippery fish from getting away.
    Osprey_InFlight_6650.jpg
  • An African lioness (Panthera leo) rubs her head against her young cub in the Maasai Mara National Reserve in Kenya.
    Kenya_Maasai-Mara_Lioness_Cub_5210.jpg
  • A trumpeter swan (Cygnus buccinator) lifts its head while swimming in the Firehole River in Yellowstone National Park, Wyoming.
    Swan-Trumpeter_Firehole-River_Yellow...jpg
  • A greater yellowlegs (Tringa melanoleuca) plunges its head into shallow water along the Stillaguamish River near Stanwood, Washington. Greater yellowlegs feed on insects, small fish, marine worms, and crustaceans, sometimes using their bills to stir up water.
    Yellowlegs-Greater_Foraging_Stillagu...jpg
  • A greater yellowlegs (Tringa melanoleuca) plunges its head into shallow water along the Stillaguamish River near Stanwood, Washington. Greater yellowlegs feed on insects, small fish, marine worms, and crustaceans, sometimes using their bills to stir up water.
    Yellowlegs-Greater_Foraging_Stillagu...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
  • An owlet of a great horned owl (Bubo virginianus) pokes its head out from its mother's feathers on their nest near Wiley Slough in the Skagit Wildlife Area near Mount Vernon, Washington.
    Owl_Great-Horned_Nest_Owlet_5803.jpg
  • An Anna's hummingbird (Calypte anna) shows off the iridescent feathers on its head and back while resting on the branch of a rhododenron in Snohomish County, Washington. All hummingbirds have iridescent plumage, which reflects certain wavelengths of light. Several features of the feathers result in the iridescence. Barbules, which are flat in most birds, are angled to form a V shape in hummingbirds. Also, the surface of the barbules is covered with microscopic discs containing tiny air bubbles that amplify certain colors of light and cancel out others.
    Hummingbird_Annas_Branch_8179.jpg
  • A Belding's Ground Squirrel (Spermophilus beldingi) pokes its head above its burrow in the Tuolumne Meadows of Yosemite National Park, California. Belding's Ground Squirrels are found in sagebrush and high mountain meadows in the Sierra Nevada mountains and in northeastern California.
    Squirrel_BeldingsGround_Yosemite_Tuo...jpg
  • Giant crevasses at the head of the Fox Glacier are visible from this aerial view taken in Westland National Park, New Zealand.
    NZ_FoxGlacier_Crevasse_5498.jpg
  • A bald eagle (Haliaeetus leucocephalus) fledgling prepares for its first flight by sitting at the end of its nest. Earlier, the eaglet tested its wings. Some of its down is visible, stuck in the branch behind its head.
    BaldEagle_Fledgling_3886.jpg
  • A trumpeter swan (Cygnus buccinator) lifts its head while swimming in the Firehole River in Yellowstone National Park, Wyoming.
    Swan-Trumpeter_Firehole-River_Yellow...jpg
  • An osprey (Pandion haliaetus) soars over Port Gardner near Everett, Washington, in search for fish. Osprey, also known as sea hawks or fish eagles, hover over water until they spot fish. They then plunge head and feet first to grab their prey. Barbed pads on their feet prevent slippery fish from getting away.
    Osprey_In-Flight_Everett_1085.jpg
  • A pied-billed grebe (Podilymbus podiceps) twists its head as it pulls an invertebrate out of the water in one of the Promontory Ponds in Magnuson Park, Seattle, Washington.
    Grebe_Pied-Billed_Hunting_Magnuson-P...jpg
  • A female belted kingfisher (Megaceryle alcyon) hunts from its perch on a branch over the Sammamish River in Kenmore, Washington. Kingfishers often sit on prominent exposed perches, about 5 to 20 feet above the water, searching for small fish. When they find one, they dive head first into the water to catch it.
    Kingfisher_Belted_Perched_Kenmore_21...jpg
  • A female belted kingfisher (Megaceryle alcyon) hunts from its perch in a snag over the Sammamish River in Kenmore, Washington. Kingfishers often sit on prominent exposed perches, about 5 to 20 feet above the water, searching for small fish. When they find one, they dive head first into the water to catch it.
    Kingfisher_Belted_Perched_Kenmore_09...jpg
  • A sperm whale (Physeter macrocephalus) dives off the New Zealand coast near Kaikoura. The sperm whale, also known as cachalot, is the largest of the toothed whales. Males average 52 feet (16 meters) in length, but can grow to be 67 feet (20.5 meters) long. The sperm whale gets its name from the liquid wax, called spermaceti, which is found in its head. Spermaceti is used for echolocation and communication and may help adjust the whale's buoyancy.
    SpermWhale_Diving_NewZealand_4180.jpg
  • A bald eagle (Haliaeetus leucocephalus) flies with a trout it caught in Pattison Lake near Lacey, Washington. The scientific name of the bald eagle means sea eagle with a white head. While bald eagles are known to eat birds and small mammals, a number of studies conclude that fish make up 60 percent or more of their diets.
    BaldEagle_Trout_PattisonLake_7504.jpg
  • Strong Pacific Ocean waves pound the rock that is home to Tillamook Rock Lighthouse near Cannon Beach, Oregon. Tillamook Rock Lighthouse, also known as Tillamook Rock Light, operated from 1881 to 1957. It was the most expensive lighthouse in the United States to operate because of strong storms that hampered construction and signficantly damaged the lighthouse after it was completed. Sometimes called the Tillamook Head Lighthouse, it is now privately owned and is unofficially used as a columbarium.
    OR_TillamookRockLighthouse_Waves_645...jpg
  • A Brown Pelican (Pelecanus occidentalis) dives for food into the Pacific Ocean off the coast of Puerto Vallarta, Mexico. Brown Pelicans hunt in a unique way. They fly over bodies of water, spotting fish from as far as 50 feet (15 meters) away. Once they spot a fish, they dive, plunging into the water head first and scooping up the fish and the water around it in its large pouch. It quickly strains the water from the side of its bill and swallows the fish.
    Pelican_Brown_Mexico_Diving_3676.jpg
  • Flight feathers begin to grow on the back of a juvenile bald eagle (Haliaeetus leucocephalus). Feathers begin to grow on bald eagle chicks by the time they are 27 days old. The dark feathers grow in tracts, starting with their head and back.
    BaldEagle_Chick_FeatherDevelopment_9...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
  • A bright double rainbow forms in the spray at the base of Comet Falls in Mount Rainier National Park, Washington. A 320 feet (98 meters), Comet Falls is one of the tallest waterfalls in the park. Comet Falls was so named because from certain angles, it resembles the head and tail of a comet.
    Rainier_CometFalls_8560.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 juvenile bald eagle (Haliaeetus leucocephalus) hunts for food from its snow-covered perch above the Skagit River in northern Washington state. Bald eagles typically do not develop their trademark white head until they are three or four years old.
    baldeagle-snow-juvenile.jpg
  • An adult Bald Eagle (Haliaeetus leucocephalus) appears to cry at the moon as it tries to chase off flies swarming around its head.
    BaldEagle_CryingAtMoon_Kirkland_4469.jpg
  • A brown pelican (Pelecanus occidentalis) in nonbreeding plumage hunts by diving head-first into the water of the Pacific Ocean in Olympic National Park near La Push, Washington. Pelicans feed mainly on fish they find at or near the surface. They can dive from heights of 50 feet (15 meters) or more, filling their throat pouches once they hit the water. They then strain out the water and swallow any food that was caught.
    Pelican-Brown_Diving_OlympicNP_7798.jpg
  • A brown pelican (Pelecanus occidentalis) is rendered in silhouette as it flies over Puerto Real off the coast of Esperanza on the island of Vieques, Puerto Rico, just before sunrise. The brown pelican feeds mainly on fish and is one of only two types of pelicans that feed by diving head-first into the water.
    Pelican_Brown_Silhouette_Vieques_846...jpg
  • A brown pelican (Pelecanus occidentalis) flies over the blue water of Puerto Real off the coast of Esperanza on the island of Vieques, Puerto Rico. The brown pelican feeds mainly on fish and is one of only two types of pelicans that feed by diving head-first into the water.
    Pelican_Brown_Hunting_Vieques_6760.jpg
  • A brown pelican (Pelecanus occidentalis) in nonbreeding plumage hunts by diving head-first into the water of the Pacific Ocean in Olympic National Park near La Push, Washington. Pelicans feed mainly on fish they find at or near the surface. They can dive from heights of 50 feet (15 meters) or more, filling their throat pouches once they hit the water. They then strain out the water and swallow any food that was caught.
    Pelican-Brown_OlympicNP_Diving_6501.jpg
  • A brown pelican (Pelecanus occidentalis) flies low over Puerto Real off the coast of Esperanza on the island of Vieques, Puerto Rico, at sunrise. The brown pelican feeds mainly on fish and is one of only two types of pelicans that feed by diving head-first into the water.
    Pelican_Brown_Sunrise-Water_Vieques_...jpg
  • A brown pelican (Pelecanus occidentalis) in nonbreeding plumage hunts by diving head-first into the water of the Pacific Ocean in Olympic National Park near La Push, Washington. Pelicans feed mainly on fish they find at or near the surface. They can dive from heights of 50 feet (15 meters) or more, filling their throat pouches once they hit the water. They then strain out the water and swallow any food that was caught.
    Pelican-Brown_OlympicNP_Diving_6943.jpg
  • A brown pelican (Pelecanus occidentalis) flies over the blue water of Puerto Real off the coast of Esperanza on the island of Vieques, Puerto Rico. The brown pelican feeds mainly on fish and is one of only two types of pelicans that feed by diving head-first into the water.
    Pelican_Brown_Hunting_Vieques_0072.jpg
  • Three American bison (Bison bison) graze in deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Three-Grazing_Yellowstone...jpg
  • An American bison (Bison bison) forces its way through deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well 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
  • Two Masai giraffes (Giraffa camelopardalis tippelskirchi) practice necking, a form of fighting, as another watches in the savannah of the Maasai Mara National Reserve in Kenya. Giraffes fight by swinging their necks, hitting their opponent with their heads.
    Kenya_Maasai-Mara_Giraffes_Necking_0...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
  • Four sockeye salmon (Oncorhynchus nerka), showing their red breeding coloration, swim up the Cedar River in Renton, Washington toward their spawning grounds. Sockeye salmon are blue-tinged and silver when they live in the ocean; their bodies turn red and their heads green when they return to freshwater rivers to spawn.
    Salmon_Sockeye_Underwater_Renton_080...jpg
  • Two sockeye salmon (Oncorhynchus nerka), showing their red breeding coloration, swim up the Cedar River in Renton, Washington toward their spawning grounds. Sockeye salmon are blue-tinged and silver when they live in the ocean; their bodies turn red and their heads green when they return to freshwater rivers to spawn.
    Salmon_Sockeye_Underwater_Renton_068...jpg
  • A great blue heron (Ardea herodias) pokes its heads out of the reeds along the water in the Edmonds Marsh, Edmonds, Washington.
    Heron_GreatBlue_EdmondsMarsh_Reeds_1...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
  • Two northern shovelers (Spatula clypeata) raise their heads while swimming on a pond in the Union Bay Natural Area in Seattle, Washington. The two northern shovelers seen here are drakes, or males, in their breeding plumage. Northern shovelers feed in shallow wetlands, using their distinctive spoon-shaped bills to scoop up and filter water to collect seeds, crustaceans, and aquatic invertebrates.
    Shovelers-Northern_Drakes_Union-Bay_...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
  • An American bison (Bison bison) stands among trees as snow falls along the Firehole River in Yellowstone National Park, Wyoming. Bison are well-equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Trees_Yellowstone_6536.jpg
  • An American bison (Bison bison) forces its way through deep snow near Fountain Flat in Yellowstone National Park, Wyoming. Bison are well equiped for harsh winter conditions. They grow a winter coat of wooly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.
    Bison_Snow_Yellowstone_4275sq.jpg
  • Two 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 long exposure captures the motion of four sockeye salmon (Oncorhynchus nerka), showing their red breeding coloration, swimming fast up the Cedar River in Renton, Washington toward their spawning grounds. Sockeye salmon are blue-tinged and silver when they live in the ocean; their bodies turn red and their heads green when they return to freshwater rivers to spawn.
    Salmon_Sockeye_LongExposure_Renton_4...jpg
  • A sockeye salmon (Oncorhynchus nerka) showing its red breeding coloration, swims up the Cedar River in Renton, Washington toward its spawning grounds. Sockeye salmon are blue-tinged and silver when they live in the ocean; their bodies turn red and their heads green when they return to freshwater rivers to spawn.
    Salmon_Sockeye_Underwater_Renton_069...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
  • The sun may be going down, but this surfer is headed out to ride the waves near Santa Cruz, California. Another surfer is visible behind his left shoulder.
    SurferSilhouette.jpg
  • Three white-faced ibis (Plegadis chihi) feed at the edge of a pond in the Malheur National Wildlife Refuge in southeastern Oregon. Ibises forage in groups by walking slowly with their heads down, probing the mud with their long, curved bills.
    Ibis_WhiteFaced_Malheur_5334.jpg
  • Two Masai giraffes (Giraffa camelopardalis tippelskirchi) practice necking, a form of fighting, in the savannah of the Maasai Mara National Reserve in Kenya. Giraffes fight by swinging their necks, hitting their opponent with their heads.
    Kenya_Maasai-Mara_Giraffes_Necking_0...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
  • A long exposure captures the motion of three sockeye salmon (Oncorhynchus nerka), showing their red breeding coloration, swimming up the Cedar River in Renton, Washington toward their spawning grounds. Sockeye salmon are blue-tinged and silver when they live in the ocean; their bodies turn red and their heads green when they return to freshwater rivers to spawn.
    Salmon_Sockeye_LongExposure_Renton_4...jpg
  • A pigeon guillemot (Cepphus columba) runs across Discovery Bay to take flight near the Protection Island National Wildlife Refuge in Jefferson County, Washington. This pigeon guillemot is displaying its breeding plumage; nonbreeding adults have mostly white heads.
    Guillemot_Pigeon_RunningOnWater_Disc...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
  • 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
  • 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 downy woodpecker (Picoides pubescens) drills a hole in a tree trunk. The downy woodpecker is the smallest woodpecker in North America. This particular bird is a female; males have a red patch on the back of their heads.
    DownyWoodpeckerKenmore.jpg
  • Three bison (Bison bison) graze in a snow-covered field in the Lamar Valley in Yellowstone National Park, Wyoming. They have heavy winter coats, which allow them to graze year-round. To find grass in the winter, they sweep their heads from side to side to clear snow.
    Bison_Grazing_Winter_Lamar-Valley_Ye...jpg
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