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Rocky Mountain National Park: Why are there so many brown trees? The Mountain Pine Beetle is one of several common, native insects that challenge western pine forests. Drought conditions, mild winters, dwarf mistletoe infestations, dense late seral mature forest stands, and a lack of wildlife fires have contributed to the outbreak.

Rocky Mountain National Park, Captioned, Colorado
beetles, drought, forest, insects, national park, pine forest, rocky mountains, wildfire
Date of Video
June 5, 2005
Courtesy of the National Park Service. For a large collection of audio and video podcast episodes on many classroom topics, visit the National Park Service on iTunes U.
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