Respecting the state of savage or uncultivated life, man and other animals appear to be very similarly circumstanced; both of them being miserably su… - Lewis Gompertz

It seems that most animals produce many more offspring than can find food, but that their numbers are kept small by other animals who prey upon them, otherwise they would perish by famine: which of the two evils would be the greatest we do not pretend to determine, but as the former is the plan most adopted we must believe it to be the best.

Y: Do you include those animals which are guilty of the same crime themselves by living on prey? Should we not then save a thousand lives by killing one?
Z: We must never suppose a person or an animal guilty until they are found in the act, and then we must investigate the nature of the crime. It is true that the animal living by slaughter may be less entitled to our consideration than the animal which is harmless; but recollect, the former may plead the same excuse itself, unless his slaughter be only of those animals which live on vegetables; and then, though justice may require their destruction, it would be repugnant to the feelings of humanity to slaughter them with that plea, unless we could quite assure our conscience that our design in killing them was more to prevent their doing mischief than for our own benefit: besides, we might then extend this principle still further, and kill our own species because they are also animals of prey. It is moreover to be observed, that if one carnivorous animal kills another, he may save lives by it also, and the nature of the act will be different according to circumstances [...] And, further, it will frequently be impossible to discover when the animal becomes guilty or innocent, as it depends on such a variety of circumstances: we should therefore be more safe from infringing the laws of moral rectitude, not to interfere in this case.

Still we are not positive that if neither destroyed by enemies nor famine they would increase too much; because for aught we known the fecundity is only great because the destruction is great; instead of the numbers being limited by the destruction, as if nature had said to the camivori, do what you will, you shall not reduce the number of animals, the more you kill the more I will produce. Were the experiment tried on a small scale of letting them be well fed and indulged they might produce prodigiously, but if the experiment extended to their whole races a different result might for aught we know obtain, as we are ignorant of the law by which nature governs the mode of production.