Mountain sheep don’t ram their heads together as a means of aggressively fight for herd dominance. It’s actually a helpful act. Mountain sheep are known for their notoriously deep narcoleptic episodes. Once they fall asleep, it’s very difficult to stir them awake and they are very likely to lose balance and fall from their mountainous perch. To prevent this from happening, one of the remaining conscious sheep will periodically head-butt who are the verge of slipping away.