Someone who is really out standing in the field - such as a dairy farmer of old - probably know this to be a fact: Cows tend to graze in a north/south alignment. I don’t know how they might fare inside a CAFO barn. Taken out of their natural stance, perhaps.

Images from Google Earth have confirmed that cattle tend to align their bodies in a north-south direction.

Wild deer also display this behaviour - a phenomenon that has apparently gone unnoticed by herdsmen and hunters for thousands of years.

In the Proceedings for the National Academy of Sciences, scientists say the Earth’s magnetic fields may influence the behaviour of these animals.

The Earth is like a built-in GPS unit for certain species.