As Elk Week begins to wind down we see our bulls continuing their battle for dominance, survival and ultimately breeding rights.

These bulls can lose up to 20 percent of their body weight during the rut. A fight like this one lasting over 20 minutes can really take it's toll on a bull.

For the bachelor walking away from the battle it might be a tough night, the exhaustion from the the fight being overwhelmed by the need to secure a harem and reproduce. For the victor the same need for recovery is outweighed by keeping his harem in line and thwarting any other would be challengers.