Cows seem to know which way is north. German and Czech researchers made a review of thousands of satellite imageries of the positions of cows over the whole world. They discovered that everywhere on earth cattle seem to align themselves to the earth magnetic field in the north-south direction (Burda and Begall, 2008).
A year later, the same researchers discovered that low frequency fields, powerlines, etcetera, disrupt the magnetic alignment of cattle. Consequences? Unknown