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 o… - Lewis Gompertz

[C]ruelty is cruelty under whatever colouring it may appear; and whether exercised on a man or on a fly, cruelty is still cruelty. It matters not whether the victim be furnished with two legs or with four, with wings, with fins, or with arms; where there is sensation, there is subject for cruelty, and in proportion to the degree of sensation will its action operate.

Every animal possesses something which distinguishes it from all other animals; and this is what I understand by personal identity, or rather the identical self. This in every animal is perfectly distinct and indivisible, since the only knowledge we have of it is when it is entire; and divisibility of this is what we cannot conceive: but if indivisible, it must also be indestructible, and must always have existed. It is not possessed of any kind of consciousness: but no consciousness can, it appears, exist without it; as life itself seems to be composed of personal identity, and other essentials of the mind or body, and that it is the combination which produces consciousness.

Axiom 5. That we should never admit of the propriety of the will or volition of one animal being the agent of another, unless we should perceive its own good to result from it, or that justice should require it.