During the mating period known as the rut, mature bulls compete for the attentions of the cows and will try to defend females in their harem.
Female elk (cows) remain in groups throughout the year.
Bull Elk - Rocky Mountain National Park, Colorado, USA
Whitetail Deer - Eastern Plains, Colorado, USA
Elk - Rocky Mountain National Park, Colorado
Mule deer, Eastern Plains, Colorado, USA
Mule Deer Buck - Red Rocks Park, Colorado
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