Are [animals] not furnished with most feelings similar to our own? They indisputably evince in an eminent degree most of the same passions. Things wh… - Lewis Gompertz

It has been generally, but not always, the custom of naturalists to degrade the powers of dumb animals into mere instinct, and not to allow them reason; and on the other hand to elevate the qualities of man, by entirely disavowing the power of instinct in man, giving him the use of reason alone. It appears to me, that there is such a quality as instinct; by which I understand a desire to do any thing without knowing why, or without having the object in view which it is to reach. I am of opinion that both reason and instinct act in man and also in brutes; and I will even grant that the proportion of reason to instinct is greater in man than in other animals; but that the latter possess a great portion of reason would it seems be absurd to dispute.

I admit it as an axiom, that every animal has more right to the use of its own body than others have to use it.

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.