Well, I don’t have any problems to kill hoofstock and to feed it to other, I mean predators. There are species where you can’t do this. These are primates, for instance, great hips at particular. You cannot kill a great ape and feed it through the lion. So you have to control the birth rate. This is nowadays quite easy by hormonal pills, anti baby pills, even with the hippo muscles is such a thing, which they get every day.
