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The animals that are currently being exploited for companionship, entertainment, farming, and experiments can be liberated and lead a different life, once the public, social awareness changes. There are enough precedents in Korea too.
The Asian black bears, who were once held in captivity to harvest their biles and slaughtered, are now liberated as wild animals under national protection.
The Indo-Pacific bottlenose dolphins in Jeju, named Jedol, Choonsam, Sampal, Taesan, and Boksoon, who were once on display in aquariums, but are now liberated and are roaming freely in the oceans of Jeju.
The question is not, Can they reason? nor Can they talk? but, Can they suffer?

- Jeremy Bentham (Philosopher) -
Justice demands treating equals equally. Moral equality begins not from some superiority or uniqueness, but from our shared capacity to feel pain. Humans and non-human animals: are we really equal?

Humans, indeed, are unique in our capacity to think in moral terms, thanks to our advanced intelligence and linguistic skills.

Humans, even within the Kingdom Animalia, are unique and marvelous creatures equipped with highly advanced intelligence, language, and sociality. But does that mean humans are superior to other animals in all aspects? No. Because each animal species has its own unique set of abilities acquired from a different evolutionary course. For example, dolphins can hear supersonic waves that we cannot detect, while cheetahs can obviously run faster than us.

Thus, humans and non-human animals are not all equal, and that is not the argument of the animal liberation movement. The human rights that are entailed by unique human abilities (right to vote, right to assemble, religious freedom, etc.) do not need to be granted to other animals. Then what is the meaning of equality in an idealistic human-animal relations?

Humans and non-human animals are equal insofar as they can both suffer.
Humans and animals are equal in that they both can feel pain through their nervous system. The pain we describe in various abstract terms such as suffering, stress, depression, and ache is really how we receive and feel the external stimulus through the nervous system (peripheral nerve, spinal cord, brain). And we express the pain in not only language but also by writhing, squealing, frowning, etc.

The degree varies per species, but non-human animals feel pain too with their relatively advanced nervous system. And it is already scientifically well-documented that they express it through noise and behavior comparable to ours, though not necessarily in verbal language. This is a readily understandable fact-- one that does not require a sojourn into the science library-- if only one sees an animal flinching and escaping from a painful experience.

If animals feel pain like humans do in the same biological mechanism, then does any human uniqueness justify our infliction of pain on them? Do we have the right? See the following text, the seminal essay of the animal liberation movement.
Animal Liberation
1.
We are familiar with Black Liberation, Gay Liberation, and a variety of other movements. With Women’s Liberation some thought we had come to the end of the road. Discrimination on the basis of sex, it has been said, is the last form of discrimination that is universally accepted and practiced without pretense, even in those liberal circles which have long prided themselves on their freedom from racial discrimination. But one should always be wary of talking of “the last remaining form of discrimination.” If we have learned anything from the liberation movements, we should have learned how difficult it is to be aware of the ways in which we discriminate until they are forcefully pointed out to us. A liberation movement demands an expansion of our moral horizons, so that practices that were previously regarded as natural and inevitable are now seen as intolerable.

...

The reader is likely to be skeptical.

“Animal Liberation” sounds more like a parody of liberation movements than a serious objective. The reader may think: We support the claims of blacks and women for equality because blacks and women really are equal to whites and males—equal in intelligence and in abilities, capacity for leadership, rationality, and so on. Humans and nonhumans obviously are not equal in these respects. Since justice demands only that we treat equals equally, unequal treatment of humans and nonhumans cannot be an injustice.



This is a tempting reply, but a dangerous one. It commits the nonracist and non-sexist to a dogmatic belief that blacks and women really are just as intelligent, able, etc., as whites and males—and no more. Quite possibly this happens to be the case. Certainly attempts to prove that racial or sexual differences in these respects have a genetic origin have not been conclusive. But do we really want to stake our demand for equality on the assumption that there are no genetic differences of this kind between the different races or sexes? Surely the appropriate response to those who claim to have found evidence for such genetic differences is not to stick to the belief that there are no differences, whatever the evidence to the contrary; rather one should be clear that the claim to equality does not depend on IQ. Moral equality is distinct from factual equality. Otherwise it would be nonsense to talk of the equality of human beings, since humans, as individuals, obviously differ in intelligence and almost any ability one cares to name. If possessing greater intelligence does not entitle one human to exploit another, why should it entitle humans to exploit nonhumans?

Jeremy Bentham expressed the essential basis of equality in his famous formula: “Each to count for one and none for more than one.” In other words, the interests of every being that has interests are to be taken into account and treated equally with the like interests of any other being. Other moral philosophers, before and after Bentham, have made the same point in different ways. Our concern for others must not depend on whether they possess certain characteristics, though just what that concern involves may, of course, vary according to such characteristics.

Bentham, incidentally, was well aware that the logic of the demand for racial equality did not stop at the equality of humans. He wrote:

The day may come when the rest of the animal creation may acquire those rights which never could have been withholden from them but by the hand of tyranny. The French have already discovered that the blackness of the skin is no reason why a human being should be abandoned without redress to the caprice of a tormentor. It may one day come to be recognized that the number of the legs, the villosity of the skin, or the termination of the os sacrum, are reasons equally insufficient for abandoning a sensitive being to the same fate. What else is it that should trace the insuperable line? Is it the faculty of reason, or perhaps the faculty of discourse? But a full-grown horse or dog is beyond comparison a more rational, as well as a more conversable animal, than an infant of a day, or a week, or even a month, old. But suppose they were otherwise, what would it avail? The question is not, Can they reason? nor Can they talk? but, Can they suffer?



Surely Bentham was right. If a being suffers, there can be no moral justification for refusing to take that suffering into consideration, and, indeed, to count it equally with the like suffering (if rough comparisons can be made) of any other being.

So the only question is: do animals other than man suffer? Most people agree unhesitatingly that animals like cats and dogs can and do suffer, and this seems also to be assumed by those laws that prohibit wanton cruelty to such animals. Personally, I have no doubt at all about this and find it hard to take seriously the doubts that a few people apparently do have. The editors and contributors of Animals, Men and Moralsseem to feel the same way, for although the question is raised more than once, doubts are quickly dismissed each time. Nevertheless, because this is such a fundamental point, it is worth asking what grounds we have for attributing suffering to other animals.



It is best to begin by asking what grounds any individual human has for supposing that other humans feel pain. Since pain is a state of consciousness, a “mental event,” it can never be directly observed. No observations, whether behavioral signs such as writhing or screaming or physiological or neurological recordings, are observations of pain itself. Pain is something one feels, and one can only infer that others are feeling it from various external indications. The fact that only philosophers are ever skeptical about whether other humans feel pain shows that we regard such inference as justifiable in the case of humans.

Is there any reason why the same inference should be unjustifiable for other animals? Nearly all the external signs which lead us to infer pain in other humans can be seen in other species, especially “higher” animals such as mammals and birds. Behavioral signs—writhing, yelping, or other forms of calling, attempts to avoid the source of pain, and many others—are present. We know, too, that these animals are biologically similar in the relevant respects, having nervous systems like ours which can be observed to function as ours do.



The grounds we have for believing that other mammals and birds suffer are, then, closely analogous to the grounds we have for believing that other humans suffer. It remains to consider how far down the evolutionary scale this analogy holds. Obviously it becomes poorer when we get further away from man. To be more precise would require a detailed examination of all that we know about other forms of life. With fish, reptiles, and other vertebrates the analogy still seems strong, with molluscs like oysters it is much weaker. Insects are more difficult, and it may be that in our present state of knowledge we must be agnostic about whether they are capable of suffering.

The point is that on this issue there are few critics who are genuinely detached. People who eat pieces of slaughtered nonhumans every day find it hard to believe that they are doing wrong; and they also find it hard to imagine what else they could eat. So for those who do not place nonhumans beyond the pale of morality, there comes a stage when further argument seems pointless, a stage at which one can only accuse one’s opponent of hypocrisy and reach for the sort of sociological account of our practices and the way we defend them that is attempted by David Wood in his contribution to this book. On the other hand, to those unconvinced by the arguments, and unable to accept that they are merely rationalizing their dietary preferences and their fear of being thought peculiar, such sociological explanations can only seem insultingly arrogant.


2.
The logic of speciesism is most apparent in the practice of experimenting on nonhumans in order to benefit humans. This is because the issue is rarely obscured by allegations that nonhumans are so different from humans that we cannot know anything about whether they suffer. The defender of vivisection cannot use this argument because he needs to stress the similarities between man and other animals in order to justify the usefulness to the former of experiments on the latter. The researcher who makes rats choose between starvation and electric shocks to see if they develop ulcers (they do) does so because he knows that the rat has a nervous system very similar to man’s, and presumably feels an electric shock in a similar way.



It is a significant indication of the level of acceptability of these practices that, although these experiments are taking place at this moment on university campuses throughout the country, there has, so far as I know, not been the slightest protest from the student movement. Students have been rightly concerned that their universities should not discriminate on grounds of race or sex, and that they should not serve the purposes of the military or big business. Speciesism continues undisturbed, and many students participate in it. There may be a few qualms at first, but since everyone regards it as normal, and it may even be a required part of a course, the student soon becomes hardened and, dismissing his earlier feelings as “mere sentiment,” comes to regard animals as statistics rather than sentient beings with interests that warrant consideration.

Argument about vivisection has often missed the point because it has been put in absolutist terms: would the abolitionist be prepared to let thousands die if they could be saved by experimenting on a single animal? The way to reply to this purely hypothetical question is to pose another: Would the experimenter be prepared to experiment on a human orphan under six months old, if it were the only way to save many lives? (I say “orphan” to avoid the complication of parental feelings, although in doing so I am being overfair to the experimenter, since the nonhuman subjects of experiments are not orphans.) A negative answer to this question indicates that the experimenter’s readiness to use nonhumans is simple discrimination, for adult apes, cats, mice, and other mammals are more conscious of what is happening to them, more self-directing, and, so far as we can tell, just as sensitive to pain as a human infant. There is no characteristic that human infants possess that adult mammals do not have to the same or a higher degree.



The experimenter, then, shows a bias for his own species whenever he carries out an experiment on a nonhuman for a purpose that he would not think justified him in using a human being at an equal or lower level of sentience, awareness, ability to be self-directing, etc. No one familiar with the kind of results yielded by these experiments can have the slightest doubt that if this bias were eliminated the number of experiments performed would be zero or very close to it.


3.


Factory farm animals need liberation in the most literal sense. Veal calves are kept in stalls five feet by two feet. They are usually slaughtered when about four months old, and have been too big to turn in their stalls for at least a month. Intensive beef herds, kept in stalls only proportionately larger for much longer periods, account for a growing percentage of beef production. Sows are often similarly confined when pregnant, which, because of artificial methods of increasing fertility, can be most of the time. Animals confined in this way do not waste food by exercising, nor do they develop unpalatable muscle.



How many of those who support factory farming by buying its produce know anything about the way it is produced? How many have heard something about it, but are reluctant to check up for fear that it will make them uncomfortable? To non- speciesists, the typical consumer’s mixture of ignorance, reluctance to find out the truth, and vague belief that nothing really bad could be allowed seems analogous to the attitudes of “decent Germans” to the death camps.



There will be many readers of this book who will agree that factory farming involves an unjustifiable degree of exploitation of sentient creatures, and yet will want to say that there is nothing wrong with rearing animals for food, provided it is done “humanely.” These people are saying, in effect, that although we should not cause animals to suffer, there is nothing wrong with killing them.

There are two possible replies to this view. One is to attempt to show that this combination of attitudes is absurd. Roslind Godlovitch takes this course in her essay, which is an examination of some common attitudes to animals. She argues that from the combination of “animal suffering is to be avoided” and “there is nothing wrong with killing animals” it follows that all animal life ought to be exterminated (since all sentient creatures will suffer to some degree at some point in their lives). Euthanasia is a contentious issue only because we place some value on living. If we did not, the least amount of suffering would justify it. Accordingly, if we deny that we have a duty to exterminate all animal life, we must concede that we are placing some value on animal life.



[The] second reply is that so long as we think that a nonhuman may be killed simply so that a human can satisfy his taste for meat, we are still thinking of nonhumans as means rather than as ends in themselves. The factory farm is nothing more than the application of technology to this concept. Even traditional methods involve castration, the separation of mothers and their young, the breaking up of herds, branding or ear- punching, and of course transportation to the abattoirs and the final moments of terror when the animal smells blood and senses danger. If we were to try rearing animals so that they lived and died without suffering, we should find that to do so on anything like the scale of today’s meat industry would be a sheer impossibility. Meat would become the prerogative of the rich.



I have not discussed such problems because they are side issues compared with the exploitation of other species for food and for experimental purposes. On these central matters, I hope that I have said enough to show that this book, despite its flaws, is a challenge to every human to recognize his attitudes to nonhumans as a form of prejudice no less objectionable than racism or sexism. It is a challenge that demands not just a change of attitudes, but a change in our way of life, for it requires us to become vegetarians.

Can a purely moral demand of this kind succeed? The odds are certainly against it. The book holds out no inducements. It does not tell us that we will become healthier, or enjoy life more, if we cease exploiting animals. Animal Liberation will require greater altruism on the part of mankind than any other liberation movement, since animals are incapable of demanding it for themselves, or of protesting against their exploitation by votes, demonstrations, or bombs. Is man capable of such genuine altruism? Who knows?
If this book does have a significant effect, however, it will be a vindication of all those who have believed that man has within himself the potential for more than cruelty and selfishness.
Peter Singer, April 5th, 1973
​Edited by Animal Liberation Wave