• Photo of golden aspen with Hallet Peak in the background. NPS Photo by J. Frank

    Rocky Mountain

    National Park Colorado

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Elk Harem

a photo of an elk harem
A bull elk bugles to his harem in Rocky Mountain National Park.
Photo courtesy of Rocky Mountain National Park.

Did You Know?

a photo of the mountains at treeline

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