It may look like a teenagers prank but it's actually for the cows own good.  Ranchers in Africa are using the lil trick to protect their livestock from lions and other ambush predators.  It could be a more humane method of managing the cattle. Humane for the predators I mean, not having to shoot them and it could prove far more cost efficient not having to build fences.  In a statement by researcher Neil Jordan a study co-author from the University of New South Wales in Australia, he says "lions are ambush predators that rely on stalking, and therefore the element of surprise, so being seen by their prey can lead to them abandoning the hunt,". The study involved painting eyes on some of the cattles butts to see which were more likely to survive. Turns out the butt eyes are showing to be a deterrent.