From the BBC –
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 can be viewed as a huge magnet, with magnetic north and south situated close to the geographical poles.
Many species – including birds and salmon – are known to use the Earth’s magnetic fields in migration, rather like a natural GPS.