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Making America's Best Idea Even Better
Rocky Mountain National Parkphoto of hikers on Bierstadt trail
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Rocky Mountain National Park
Long-Tailed Weasel
a photo of a long-tailed weasel
Courtesy of NPS
Long-tailed Weasel
a photo of the mountains at treeline  

Did You Know?
Temperature causes tree line. Trees need an average growing temperature of about 50 degrees fahrenheit.

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Last Updated: September 28, 2006 at 13:05 EST