About a thousand years ago, large, wild herbivores started to disappear from Europe. Hunting, poaching and loss of biotope led to their decline. And with the vanishing of those large animals, their behaviour and its influence on the environment stopped too. Not only their grazing behaviour and its effect on vegetation but also the wallowing, rooting and digging. As for the last one, wild bulls used to dig pits in the rutting season to impress the opponents and the cows. As it appears now, these pits were hotspots for pioneer plants and insects.