"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."
— Chimpanzees

January 1, 1970

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Added on April 10, 2026
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Primates
Original Language: English

Sources

Jeffrey Moussaieff Masson and Susan McCarthy, When Elephants Weep: The Emotional Lives of Animals (London: Vintage, 1996. , Preface, p. 15