Colorado's high alpine forests are dominated by the lodgepole pine (Pinus contorta, far left, left-center, and far right) and the Engelmann spruce (Picea engelmannii, bottom center, bright brown cones). Brown and grey beetle-killed trees stand in the background as a reminder of both species' vulnerability to bark beetle infestations.
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Rocky Mountain National Park
August 7, 2009
Public domain via wikimedia commons; original file taken from flickr with creative commons license.