Most cows stand in a circle, all facing outwards, to watch for predators whilst they eat. They also walk forward, expanding the circle, to ensure fresh grass, and not that stained with brown pies. Their fart gasses do enter with force towards the centre of the circle, and due to the coriolis force, rotate, forming a huge rising centrifuge. Glider pilots and helo drivers are often caught up in this phenomena.
I could go on, but I have to open another beer....