A bull elk lets out a call to his harem after crossing the Snake River at dawn Thursday in Grand Teton National Park. The mating ritual called the "rut" where bulls court cows into groups is drawing to a close, but the bulls will agressively guard their harems from other males for another couple weeks. After mating season the cows and bulls will split into groups of cows and bulls and will begin migrating to their winter feeding grounds. For most of the elk in Grand Teton National Park, this means a pilgrimage to the National Elk Refuge.
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