The rivalry between Bighorn Sheep rams during the rut is fascinating to watch. The rams cluster closely together, pawing at each other in an attempt to entice a confrontation and even the violent crashing of heads. Then they quickly rejoin the scrum. Sometimes they knock horns without leaving the group. I loved this image that shows two rams appearing as if they are nose to nose, in what seems to be a stare-down that might result in a challenge and ultimately, a head-on crashing of those huge horns. A set can weigh thirty pounds or more.