"[F]or practical purposes I am fairly sure, judging from man's past record of attempts to mold nature to his own aims, that we would be more likely to increase the net amount of animal suffering if we interfered with wildlife, than to decrease it. Lions play a role in the ecology of their habitat, and we cannot be sure what the long-term consequences would be if we were to prevent them from killing gazelles. ... So, in practice, I would definitely say that wildlife should be left alone ... The remaining question is purely hypothetical, and perhaps it would be politic to refuse to answer it. Nevertheless, philosophers are supposed to answer hypothetical questions, so I will risk it. If, in some way, we could be reasonably certain that interfering with wildlife in a particular way would, in the long run, greatly reduce the amount of killing and suffering in the animal world, it would, I think, be right to interfere."