A bull Yellowstone Moose (Alces alces shirasi) feeds on willow shrubs as the winter sun rises in the Lamar Valley of Yellowstone National Park, Wyoming. Bull moose typically have antlers, but they lose them in the winter in order to conserve energy. The Yellowstone moose is the smallest of the four subspecies of moose found in North America, although it is the largest member of the deer family that resides in the park.
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