“Most of the more complex emotions are common to the higher animals and ourselves. Every one has seen how jealous a dog is of his master's affection, if lavished on any other creature; and I have observed the same fact with monkeys. This shews that animals not only love, but have the desire to be loved.”

— Charles Darwin , book The Descent of Man, and Selection in Relation to Sex

volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", pages 41-42 http://darwin-online.org.uk/content/frameset?pageseq=54&itemID=F937.1&viewtype=image
The Descent of Man (1871)

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Charles Darwin 161

British naturalist, author of "On the origin of species, by… 1809–1882

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“Love in animals, has not for its only object animals of the same species, but extends itself farther, and comprehends almost every sensible and thinking being. A dog naturally loves a man above his own species, and very commonly meets with a return of affection.”

David Hume book A Treatise of Human Nature

Part 2, Section 12
A Treatise of Human Nature (1739-40), Book 2: Of the passions

“The desire to protect animals derives inevitably from better acquaintance with them, from the realization that they are sensitive and intelligent creatures, affectionate and seeking affection, powerless in a cruel and incomprehensible world, exposed to all the whims of the master species. According to the animal haters, those who are fond of animals are sick people. To me it seems just the other way around, that the love for animals is something more, not something less. As a rule, those who protect animals have for them the same feeling as for all the other defenseless or abused creatures: the battered or abandoned children, the sick, the inmates of penal or mental institutions, who are so often maltreated without a way of redress. And those who are fond of animals don't love them for their "animality" but for their "humanity" — their "human" qualities. By which I mean the qualities humans display when at their best, not at their worst. Man's love for the animal is, at any rate, always inferior in intensity and completeness to the love the animal has for the human being that has won its love. The human being is the elder brother, who has countless different preoccupations, activities and interests. But to the animal that loves a human being, this being is everything. That applies not only to the generous, impetuous dog, but also to the more reserved species, with which it is more difficult to establish a relationship without personal effort and plenty of patience.”

Hans Ruesch (1913–2007) Swiss racing driver

Source: Slaughter of the Innocent (1978), pp. 45-46

“The only thing I care about is whether a monkey will turn out a property I can publish. I don't have any love for them. Never have. I don't really like animals. I despise cats. I hate dogs. How could you like monkeys?”

Harry Harlow (1905–1981) American psychologist

Interview with Pittsburgh Press-Roto, 1974. Quoted in Blum, Deborah. The Monkey Wars. Oxford University Press, 1994, p. 92.

“Many dogs, cats and horses are loved and cherished, and are even mourned when they die. But pigs, chickens, calves and other animals grown in factory farms are treated in the most brutal and exploitative way, devoid of all affection. They are units in a production line; their only purpose is to produce the maximum amount of food at the minimum cost. Factory farms epitomize the mechanistic spirit. … To justify this treatment, the less-favoured animals have to be regarded as inferior, unworthy of any sentimental attachment. A terrible conflict arises if the exploited animals are considered to have any value in themselves. One way to avoid this conflict is to keep the privileged and the exploited animals in separate categories in our minds. … But if emotions spill over from pets to other animals, there is trouble. People become vegetarians, or even animal rights activists.”

Rupert Sheldrake (1942) English biochemist, author and parapsychological researcher

Seven Experiments That Could Change the World (London: Fourth Estate, 1994), p. 24.

“While we call ourselves animal lovers, and lavish kindness on our dogs and cats, we inflict brutal deprivations on billions of animals that are just as capable of suffering. The hypocrisy is so rank that future generations will marvel at how we could have failed to see it.”

George Monbiot (1963) English writer and political activist

"Goodbye – and good riddance – to livestock farming" https://www.theguardian.com/commentisfree/2017/oct/04/livestock-farming-artificial-meat-industry-animals, The Guardian, 4 October 2017.

“I have always defined myself halfway between an animal and a man, however in full respect of others. I am a pure instinct and I act as such. Thinking of an animal, I love monkeys …”

Rocco Siffredi (1964) Italian pornographic actor, director, producer and entrepreneur

Interview by Andrea Di Marcantonio

“As dogs, cats, horses, and probably all the higher animals, even birds, as is stated on good authority, have vivid dreams, and this is shewn by their movements and voice, we must admit that they possess some power of imagination. … Few persons any longer dispute that animals possess some power of reasoning. Animals may constantly be seen to pause, deliberate, and resolve. It is a significant fact, that the more the habits of any particular animal are studied by a naturalist, the more he attributes to reason and the less to unlearnt instincts.”

Charles Darwin book The Descent of Man, and Selection in Relation to Sex

volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", page 46 http://darwin-online.org.uk/content/frameset?pageseq=59&itemID=F937.1&viewtype=image
The Descent of Man (1871)

“Sometimes captured from the great arboreal freedom of their jungle homes, monkeys are closely confined in cages only three or four feet square. … They can never sit or lie down on a flat, soft or yielding surface. Little wonder that by the time they are needed for the knife or the needle they are so crazed or inert that they are no longer representative examples of animal life. Psychologists who study the behaviour of thousands of such creatures annually, rarely make allowances for the fact that their pathetic subjects have been so deprived that they have become more like monsters than animals. Many people who have experienced close affectionate relationships with individuals of other species testify to the considerable potential for emotional and intellectual development that animals have. When properly cared for a pet dog or cat can develop great subtleties of behaviour that the laboratory animal never shows. Those who have been fortunate enough to closely observe unfrightened animals living in the wild are often struck by the complexity and richness of the life they lead. These positive pleasures the laboratory animal never knows; for him the same four white walls and the smell of disinfectant.”

Richard D. Ryder (1940) British psychologist

Experiments on Animals (1971)

“I believe that animals have rights which, although different from our own, are just as inalienable. I believe animals have the right not to have pain, fear or physical deprivation inflicted upon them by us. Even if they are on the way to the slaughterhouse, animals have the right to food and water and shelter if it is needed. They have the right not to be brutalized in any way as food resources, for entertainment or any other purpose. … Finding a substitute for animals in research has only recently become an imperative in the scientific community. … One day animals will not be used in the laboratory. How soon that day comes depends on how soon people stop screaming and make the search for alternatives a major research imperative. As long as conferences on the subject sound like feeding time in the monkey house, monkeys along with millions of other animals are going to stay right where they are now — in the laboratory.”

Roger A. Caras (1928–2001) American photographer

"We Must Find Alternatives to Animals in Research," in Newsweek (26 December 1988)

“The professional and financial interest in continuing animal experimentation helps to explain at least some resistance to the notion that animals have a complex emotional life and are capable of experiencing the higher emotions, such as love, compassion, altruism, disappointment and nostalgia. To acknowledge such a possibility implies certain moral obligations. If chimpanzees can experience loneliness and mental anguish, it becomes more wrong to use them for experiments in which they are isolated and anticipate daily pain.”

Jeffrey Moussaieff Masson book When Elephants Weep

Preface, p. 15
When Elephants Weep (1994)

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Charles Darwin 161

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