Not sure if this is a bug but I was mining iron ore outside somewhere (one of the veins near white run) and two elks just died next to me, I didn't attack them and no one else was arround. I heard no sounds of arrows or found any nearby. Used Detect Life, Detect Dead and the shout version and found nothing around...
So.. Is it possible they just like died of natural causes or something? Ran themselves to death or possibly attacked each other (thought that was impossible, being of same faction and all... not to mention the fact that they seem to run at the sight of their own shadows) Had no cloaks on other AOE spells.