Clouds and fog, Big Sur, California.
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Grand Prismatic Spring, Yellowstone.
Tufa towers, Mono Lake, California.
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Oscellated turkey feathers, San Antonio Zoo.
Autumn oak leaves, Yosemite.
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Ibex Dunes, Death Valley, California.
Mountain lion, Arizona-Sonora Desert Museum.
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Cuernos de Paine, Chile.
Dawn in a Florida pine forest.
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Sunset, Bosque del Apache, New Mexico.
Virgin River Canyon, Zion National Park, Utah.
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Storm waves, Monterey Peninsula, California.
Ferruginous hawk feathers (a wild bird), California.
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Barrel cactus flowers, California.
Wall Street formations, Arches National Park, Utah.
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Sumatran tiger, San Diego Safari Park.
Blue-eyed darner dragonfly, California.
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Mountain peacock-pheasant, San Diego Zoo.
Towers of the Virgin, Zion National Park, Utah.
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Great horned owl at sunset, Everglades, Florida.
Common poorwill (a wild bird), California.
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Rodent tracks, Coral Pink Sand Dunes, Utah.
Cholla garden, Joshua Tree National Park, California.
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Snow geese and rainbow, Bosque del Apache, New Mexico.
Eight-spotted skimmer, Idaho.
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Eroded red sandstone, Arches National Park, Utah.
Ferruginous hawk, California.
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Thunderstorm, Two Peoples Bay, Western Australia.
Male bufflehead, California.
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Great Basin Collared lizard, California.
Half Dome, winter storm, Yosemite National Park.
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Monarch butterfly, California.
Manzanita bark, California.
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Victoria's riflebird, Queensland, Australia.
Sumatran tiger, San Diego Safari Park.
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Sea otter, California.
American avocets, California.
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Half Dome from Glacier Point, Yosemite National Park.
Pines at sunset, Big Cypress, Florida.
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Towers of the Virgin after snow, Zion National Park, Utah.
Beach sunset, Monterey Peninsula, California.
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Blue-eyed darner dragonfly, California.
Dipper, Zion National Park, Utah.
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Sandhill cranes at sunset, Bosque del Apache, New Mexico.
Ghost flower, California desert.
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Gates of the Valley, Yosemite National Park.
Bathing green jay, Rio Grande Valley, Texas.
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Wandering glider, California.
Painted bunting, Manhattan, Kansas.
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Tail feathers of great blue turaco, San Diego Safari Park.
Variegated meadowhawk, California.
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Male king eider, Barrow, Alaska.
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