Predators are usually not that good for keeping animal populations in check. They often kill more than they can eat and leave the rest alone[1]. If you introduce predators for population control you would have to introduce scavengers as well. Otherwise rangers will have to clean up after them or the carcasses become a problem.<p>In the end you would need a whole and healthy ecosystem for this to work out correctly.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Surplus_killing" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Surplus_killing</a>