text: how happens the equilibrium between predators and preys?   predators and prey have a relatively simple relationship. if there is not enough prey the predators must compete too much and die off a bit. if there are too many predators the prey dies and then the predators follow. if there is too much prey the predators multiply until there are too few and then die off. if there are not enough predators and too much prey the prey will die of natural causes such as disease and starvation due to overcompetition for food  so an equilibrium is really nonexistent, there is a constant state of change