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Sandstone formations with clouds, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Adult brown pelicans (Pelecanus occidentalis), on Isla Ildefonso, Baja California Sur, Mexico, North America

Sunset through pine trees, Lake George, The Adirondack Mountains, New York State, United States of America, North America

Transient killer whale (Orcinus orca), breaching near whale watching boat, Monterey, California, United States of America, North America

A wild American alligator (Alligator mississippiensis), at night in Shark Valley, Everglades National Park, Florida, United States of America, North America

Aerial view of north shore, Pololu Valley, Big Island, Hawaii, United States of America, North America

Aerial view of Kahikolu Congregation Church, Big Island, Hawaii, United States of America, North America

Aerial view of volcanic landscape, Mauna Kea, Big Island, Hawaii, United States of America, North America

The Painted Ladies, Alamo Square, San Francisco, California, United States of America, North America

Afternoon light on Horsetail Falls, an occurence that happens once or twice a year in late February due to the angle of the sun and snow melt on the cliffs, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

A lone adult male killer whale (Orcinus orca) encountered in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, Pacific Ocean, North America

Backlit hoodoos and Thor's Hammer at sunrise, Bryce Canyon National Park, Utah, United States of America, North America

Cottonwood tree and reeds, Zion National Park in autumn, Utah, United States of America, North America

Bull elk (Cervus canadensis), in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Skyline seen from the Chesnut Street Bridge across the Schuylkill River, Philadelphia, Commonwealth of Pennsylvania, United States of America, North America

The Dyke with fall colors, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

Sandhill crane (Grus canadensis) in flight, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Great Gray Owl (Great Grey Owl) (Strix nebulosa) female and 13-day-old chick, Yellowstone National Park, Wyoming, United States of America, North America

Tent encampment in reenactment of French Indian War of 1759, Old Fort Niagara dating from 1679, Youngstown, New York State, United States of America, North America

World globe with stock market symbols, New York City, New York, United States of America, North America

Architectural detail of the New York Public Library (NYPL), second largest in the USA and fourth largest in the world, New York City, United States of America, North America

Bryce Canyon at dawn, from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Adult brown bear pair (Ursus arctos) fishing for pink salmon at Pavlof Harbor on Chichagof Island, Southeast Alaska, United States of America, North America

Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

A rare sighting of an adult female sea otter (Enhydra lutris kenyoni) hauled out on land in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Harbor seals (Phoca vitulina) hauled out on a submerged log in Misty Fjord National Monument, Southeast Alaska, United States of America, North America

An old brick house displaying an American flag and surrounded by autumn foliage in Townshend, Vermont, New England, United States of America, North America

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

Beach at Seawall, Mount Desert Island, near Arcadia National Park, Maine, New England, United States of America, North America

The sandstone spire of Castleton Tower dominates the Castle Valley, near the Colorado River and Moab, Utah, United States of America, North America

South Window Arch seen through Turret Arch, Arches National Park, Utah, United States of America, North America

Upper section of Bear Canyon facing south, located in northeastern section of Prescott National Forest near Drake, Arizona, United States of America, North America

Snowscape of thermal feature with reflection, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of hoodoo formations from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America

Rock Creek Lake in the fall with fog, Inyo National Forest, California, United States of America, North America

Red barn and old farm equipment, Valle Crucis, North Carolina, United States of America, North America

Mount Moran framed by snow covered trees, Grand Teton National Park, Wyoming, United States of America, North America

Yellowbelly marmot (Yellow-bellied marmot) (Marmota flaviventris), Shoshone National Forest, Wyoming, United States of America, North America

Sunrise at Font's Point, Anza-Borrego Desert State Park, California, United States of America, North America

Male red-winged blackbird (Agelaius phoeniceus) displaying, San Jacinto Wildlife Area, California, United States of America, North America

Mule deer (Odocoileus hemionus) buck in velvet, Glacier National Park, Montana, United States of America, North America

Wind turbines generating electricity, Santa Barbara, California, United States of America, North America

Double-crested cormorant (Phalacrocorax auritus), Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Cactus wren (Campylorhynchus brunneicapillus), Rockhound State Park, New Mexico, United States of America, North America

Icicles hanging from a rock with fresh snow, Zion National Park, Utah, United States of America, North America

Close-up of captive Siberian tiger (Panthera tigris altaica), near Bozeman, Montana, United States of America, North America

View of hoodoo formations from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America

Old Faithful Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Northern pintail (Anas acuta), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Cliffs of Sycamore Falls with dry inactive waterfalls, Kaibab National Forest near Williams, Arizona, United States of America, North America

El Capitan, a 3000 feet granite monolith on the right, Cathedral Rocks and Cathedral Spires on the left, with the Merced River flowing through flooded meadows of Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

Moro Rock and the high mountains of the Sierra Nevada, Sequoia National Park, California, United States of America, North America

Male house finch (Carpodacus mexicanus), The Pond, Amado, Arizona, United States of America, North America

The Three Gossips and common paintbrush (Castilleja chromosa), Arches National Park, Utah, United States of America, North America

An adult Arctic ground squirrel (Urocitellus parryii) standing in the brush at Denali National Park, Alaska, United States of America, North America

Landscape of June Lake with trees in fall colours and snow capped mountains in the background, in California, United States of America, North America

The main concourse of Grand Central Station, Manhattan, New York, United States of America, North America

Swamp trees silhouetted against the blue sky near New Orleans, Louisiana, United States of America, North America

California redwoods, Armstrong Woods State Park, near Guerneville, California, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

Autumn colours at Bowman Lake, Glacier National Park, Montana, United States of America, North America

Adult Risso's dolphins (Grampus griseus) surfacing in Monterey Bay National Marine Sanctuary, California, United States of America, North America

A sign posted by the Park Service pointing the way to Cape Final on the North Rim of Grand Canyon, Arizona, United States of America, North America

View of Grand Canyon from Bright Angel Point on the North Rim, with Brahma and Zoroaster Temples visible in the distance an Oza Butte on far right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Adult California sea lion (Zalophus californianus) underwater at Los Islotes, Baja California Sur, Mexico, North America

Tufas of calcium carbonate at lake in Mono Lake Tufa State Reserve, with mountains in the background, in California, United States of America, North America

Frozen bison (Bison bison), on a river bank, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Adult California sea lion (Zalophus californianus) underwater at Los Islotes, Baja California Sur, Mexico, North America

Morning Glory pool hot spring in the snow with reflections, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue thermal feature shrouded in fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

California sea lions (Zalophus californianus) hauled out on Los Islotes, Baja California Sur, Mexico, North America

Colourful Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Hermit Canyon at Grand Canyon viewed from the east side of Yuma Point along the Boucher Trail with Pima Point on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Adult Mexican long-nosed bat (Leptonycteris yerbabuenae), at a feeder at night, Westward Look Resort, Tucson, Arizona, United States of America, North America

Organ pipe cactus (Stenocereus thurberi) at night in Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, United States of America, North America

Snow goose (Chen caerulescens) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

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

Glacier Bay National Park, viewed from Princess Star Cruise Ship, Alaska, United States of America, North America