This Oct. 9, 2010 photo shows two bull elk as they vie for dominance during the fall rut in Estes Park, Colo. Most fights are brief, as the bulls must avoid injury and conserve their energy to survive... more 
This Oct. 9, 2010 photo shows two bull elk as they vie for dominance during the fall rut in Estes Park, Colo. Most fights are brief, as the bulls must avoid injury and conserve their energy to survive the winter. There are certain signs of fall in the town of Estes Park: the chill of morning frost, the reds and yellows of autumn leaves, and the thousands of elk that visit the town. The elk come looking for romance; the tourists come looking for elk. (AP Photo/Karen Schwartz) less 
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Associated Press | Photo By Karen Schwartz
Tue, Aug 30, 2011 2:14 PM EDT