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Male Williamson's sapsucker (Sphyrapicus thyroideus) at its nest hole, Yellowstone National Park, Wyoming, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) in summer plumage, San Juan National Forest, Colorado, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams butting heads during the rut, Clear Creek County, Colorado, United States of America, North America

Male yellow-headed blackbird (Xanthocephalus xanthocephalus) dislaying, Yellowstone National Park, Wyoming, United States of America, North America

T. A. Moulton Homestead, barn, Mormon Row, Grand Teton National Park, United States of America, North America

Old barn dating from approx 1890s, west of Glacier National Park, Montana, United States of America, North America

Grizzly bear (Ursus arctos horribilis) resting, Yellowstone National Park, Wyoming, United States of America, North America

Eroded boulder at the Egg Factory, Bisti Wilderness, New Mexico, United States of America, North America

Cinnamon black bear (Ursus americanus), Yellowstone National Park, Wyoming, United States of America, North America

Golden evening sunshine illuminates El Capitan and Half Dome in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Bethesda Fountain, Central Park, Manhattan, New York City, New York, United States of America, North America

United Nations Headquarters, The United Nations Secretariat Building, Manhattan, New York City, New York, United States of America, North America

United Nations Headquarters, The United Nations Secretariat Building, Manhattan, New York City, New York, United States of America, North America

Tenaya Lake in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite Valley choked with smoke from the Dog Rock Wildfire, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yellow and orange aspens with evergreens in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Swift Fox (Vulpes velox) kit, Pawnee National Grassland, Colorado, United States of America, North America

Bald eagle (Haliaeetus leucocephalus), Chugach National Forest, Alaska, United States of America, North America

Anza-Borrego Desert State Park, Borrego Springs, California, United States of America, North America

Manhattan Bridge on a cold foggy day, Brooklyn, New York City, United States of America, North America

Bison (Bison bison) bull covered with snow in snowfall in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Lower Manhattan skyline, New York skyline, One World Trade Center tower, tour boat, Hudson River, New York, United States of America, North America

Creek Street, Ketchikan Creek boardwalk, historic red-light district, beautiful early autumn colours, Ketchikan, Alaska, United States of America, North America

Yellowstone River and Falls, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Adult sea otter (Enhydra lutris kenyoni) preening in the Inian Islands, Southeast Alaska, United States of America, North America

View of the commercial fishing fleet docked in the harbour at Petersburg, Southeast Alaska, United States of America

Cathedral of Our Lady of the Angels, Los Angeles, California, United States of America, North America

School of Visual and Performing Arts, Los Angeles, California, United States of America, North America

Cathedral of Our Lady of the Angels, Los Angeles, California, United States of America, North America

Snow capped mountain and fall colors, Dallas Divide, Colorado, United States of America, North America

Crab pots on deck, Grayland Dock, Grays Harbor County, near Westport, Washington coast, Washington State, United States of America, North America

Geothermal steam, frosted trees and snow-free hot ground in Norris Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Church ruins, Gran Quivira, Salinas Pueblo Missions National Monument, Salinas Valley, New Mexico, United States of America, North America

Part of the Kohta Circus petroglyph panel, Gold Butte, Nevada, United States of America, North America

Cliffs and hoodoos lit by late afternoon sun in winter, Paria View, Bryce Canyon National Park, Utah, United States of America, North America

Wall of Windows lit by early morning sun, silhouetted rock, Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America

The Empire State Building, 5th Avenue, Manhattan, New York City, New York, United States of America, North America

Broadway and 5th Avenue street signs, Manhattan, New York City, New York, United States of America, North America

Street scene at night with historic San Francisco street car, San Francisco, California, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Low clouds glowing orange at sunrise, Crater Lake National Park, Oregon, United States of America, North America

Rocks, sea stacks, and clouds at sunset, Bandon Beach, Oregon, United States of America, North America

Bison, Theodore Roosevelt National Park North Unit, Watford, North Dakota, United States of America, North America

Decorative fountain in El Presidio Park, Tucson, Arizona, United States of America (U.S.A.), North America

Rio Grande Gorge, taken from Rio Grande Gorge Bridge, near Taos, New Mexico, United States of America, North America

Tomb of the Unknown Soldier, Washington Square, Philadelphia, Pennsylvania, United States of America, North America

Jack Knife sculpture by Ed Mell, Main Street, Arts District, Scottsdale, Phoenix, Arizona, United States of America, North America

Line of Bison (Bison bison) crossing the Lamar River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly Bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Cinnamon Black Bear (Ursus americanus) yearling cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

High angle view of Central Park and the Upper West Side, Manhattan, New York City, United States of America, North America

High angle view of Central Park, cityscape looking North, Manhattan, New York City, New York, United States of America, North America

World War I and World War II on left, memorials outside the City Hall on Broadway in historic Newport, Rhode Island, New England, United States of America, North America

Northwest Glacier, Kenai National Fjord, Prince William Sound, Alaska, United States of America, North America

The Martin Luther King Memorial on the National Mall in Washington, D.C., United States of America, North America

Red fox (Vulpes vulpes) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Sandhill crane (Grus canadensis) landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Holly Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Empty Sky memorial to New Jerseyans lost during 911 attacks on the World Trade Center, Liberty State Park, Jersey City, New Jersey, United States of America, North America

Laura Grier at sunrise at The Badlands, Black Hills, South Dakota, United States of America, North America

Cascades on the partially frozen San Miguel River, San Miguel County, Colorado, United States of America, North America

Young brown bear (Ursus arctos) at low tide in Pavlof Harbour, Chichagof Island, Southeast Alaska, United States of America, North America

Young brown bear (Ursus arctos) fishing for pink salmon at low tide in Pavlof Harbour, Chichagof Island, Southeast Alaska, United States of America, North America

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America

Bare tree among boulders at sunrise, Joshua Tree National Park, California, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Fajada Butte, UNESCO World Heritage Site, New Mexico, United States of America, North America

Sunset above Yosemite Valley and Half Dome, viewed from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mountains and a stream through the tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Box elder (boxelder maple) (maple ash) (Acer negundo) with yellow leaves in the fall, Zion National Park, Utah, United States of America, North America

Sunset at Locust Point, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Cityscape from the BP Pedestrian Bridge designed by Frank Gehry which links Grant Park and Millennium Park, Chicago, Illinois, United States of America, North America

Lone tourist on Old Navajo Bridge over Marble Canyon and Colorado River, near Lees Ferry, Arizona, United States of America, North America

Conservatory of Flowers, Golden Gate Park, San Francisco, California, United States of America, North America

View from the endless bridge, Guthrie bridge, Minneapolis, Minnesota, United States of America, North America