Cattle Compass

http://news.bbc.co.uk/2/hi/science/nature/7575459.stm I do appreciate odd studies like these, but often question their conclusions. Rather than the animals having a magnetic need to face north or south, couldn't it be that they are simply trying to get the greater bodily sun coverage? I would think the widest part of the cow would get better sun if facing west/east throughout the entire day? Maybe they tend to follow fencelines? Who knows for sure. It's interesting nonetheless.