Rocky Mountain, CO

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Rocky Mountain National Park, CO - Elk - 4

Bull elk signal the season of mating with a crescendo of deep, resonant tones that rise rapidly to a high-pitched squeal before dropping to a series of grunts. It is this call, or bugle, that gives rise to the term "rut" for the mating season. Photo by Kathy Weiser-Alexander.

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CO - Elk at Rocky Mountain National Park - 4