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Several varieties occur spontaneously in nature affecting animals as diverse as elk , deer and even humans . In the early 1900 's , it was federal policy to kill large predators to protect game , such as elk , in the park ( 3 ) . The craggy peaks , forested foothills , steep valleys and pristine rivers of the 100-mile-long front form a key migratory route linking America 's largest herd of bighorn sheep - - as well as elk , grizzly bears and wolves - - to the vast ranges of the Canadian Rockies . Bordered by thousands of acres of BLM land and just minutes from the White River National Forest , Silt is also an easy place to spot wildlife such as elk , mule deer , mountain lions , black bears , coyotes , foxes , wild turkeys , and pheasants . The natural communities in this Section were influenced by large herbivores such as elk , by insects and tree diseases , by windstorms , and by drought and fire .