I was delivering twirlies to Estes Park Saturday and on the way back through Big Thompson Canyon traffic had stopped and people were looking up....at....Rocky Mountain Bighorn Sheep. We see them pretty frequently but can't always stop to get pictures. I took these at about noon on an overcast day. I think it's a group of females and young rams.
According to National Geographic they stand 5-6' tall. Fall is mating season and the lambs are born in the spring. Both males and females have horns but the females are smaller. To compete for females the males butt heads until one walks away.
I've added a video (I hope) from YouTube and National Geographic.