Reuters

Summer in Yellowstone

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The Grand Prismatic Spring, the largest in the United States and third largest in the world, is seen in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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The nearly constantly erupting Clepsydra Geyser in the Fountain Paint Pot area in Yellowstone National Park, Wyoming, June 21, 2011. REUTERS/Jim Urquhart

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A cinnamon black bear, a subspecies of the American black bear, runs between cars near Madison in Yellowstone National Park, Wyoming, June 19, 2011. REUTERS/Jim Urquhart

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A night exposure of Old Faithful Geyser, the first geyser in the park to be named, erupting in Yellowstone National Park, Wyoming, June 23, 2011. Currently the geyser erupts approximately every 90 minutes. REUTERS/Jim Urquhart

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A coyote hunts at the Lamar Valley in Yellowstone National Park, Wyoming, June 20, 2011. REUTERS/Jim Urquhart

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People stand at the brink of the 93-meter tall Yellowstone River Lower Falls in Yellowstone National Park, Wyoming, June 24, 2011. REUTERS/Jim Urquhart

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A dead pine tree on the ever changing travertine-depositing Mammoth Hot Springs in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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A bison emerges after swimming across the Yellowstone River in Yellowstone National Park, Wyoming, June 21, 2011. On average over 3,000 bison live in the park. REUTERS/Jim Urquhart

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The Grand Prismatic Spring, the largest in the United States and third largest in the world, is seen in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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A grizzly bear and her cub are seen in the Hayden Valley in Yellowstone National Park, Wyoming, June 24, 2011. REUTERS/Jim Urquhart

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A bull elk with velvet still on its antlers grazes near Madison in Yellowstone National Park, Wyoming, June 19, 2011. Over 30,000 elks spend their summer in park. REUTERS/Jim Urquhart

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A blue-billed ruddy duck takes flight from Floating Island Lake in Yellowstone National Park, Wyoming, June 24, 2011. REUTERS/Jim Urquhart

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A traffic jam is created when drivers stop to view a grizzly bear near Swan Lake in Yellowstone National Park, Wyoming in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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The shadow of a pine tree on a eroding cliff face near Tower fall in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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Grizzly bear cubs play on the snow in the Hayden Valley in Yellowstone National Park, Wyoming, June 24, 2011. REUTERS/Jim Urquhart

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A rainbow of light can be seen at the base of the 93 meter tall Yellowstone River Lower Falls in Yellowstone National Park, Wyoming, June 21, 2011. REUTERS/Jim Urquhart

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Trees on the bank are reflected in the Yellowstone River in Yellowstone National Park, Wyoming, June 21, 2011. REUTERS/Jim Urquhart

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A sign warns travelers not to walk into a thermally active region in Yellowstone National Park, Wyoming, June 23, 2011. REUTERS/Jim Urquhart

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Michael Smith, center, prepares dinner for son Parker Smith, left, and wife Stacy Smith, right, at their camp site near Norris in Yellowstone National Park, Wyoming, June 23, 2011. REUTERS/Jim Urquhart

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Dead lodgepole pine trees near a thermal feature on the shore of Yellowstone Lake in Yellowstone National Park, Wyoming, June 21, 2011. REUTERS/Jim Urquhart

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A black bear swims in Rainy Lake near Tower Fall in Yellowstone National Park, Wyoming, June 20, 2011. Black bear are commonly sighted near the tree line. REUTERS/Jim Urquhart

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Tourist photograph the Dragon's Mouth Spring in the Mud Volcano in Yellowstone National Park, Wyoming, June 23, 2011. REUTERS/Jim Urquhart

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Tourists walk around the Grand Prismatic Spring, the largest in the United States and third largest in the world, in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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The Grand Prismatic Spring, the largest in the United States and third largest in the world, is seen in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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A herd of bison graze in the Lamar Valley in Yellowstone National Park, Wyoming, June 20, 2011. On average over 3,000 bison live in the park. REUTERS/Jim Urquhart

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A wolf rolls in the snow in the Hayden Valley after killing and eating an elk in Yellowstone National Park, Wyoming, June 20, 2011. Elk are the most common food of the wolves in the park. REUTERS/Jim Urquhart

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Steam rises from geysers, including Old Faithful, in the Upper Geyser Basin in Yellowstone National Park, Wyoming, June 22, 2011. REUTERS/Jim Urquhart

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A child walks to the Dragon's Mouth Spring in the Mud Volcano in Yellowstone National Park, Wyoming, June 23, 2011. REUTERS/Jim Urquhart

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A wolf walks with a set of elk legs in the Hayden Valley after killing and eating it in Yellowstone National Park, Wyoming, June 20, 2011. Elks are the most common food of the wolves in the park. REUTERS/Jim Urquhart

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A sign warns to travelers to secure their food so as to not attract bears in Yellowstone National Park, Wyoming, June 24, 2011. REUTERS/Jim Urquhart

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