“Since Darwin, scientists have agreed that there is no ‘magical’ essential difference between human and other animals, biologically-speaking. Why then do we make an almost total distinction morally? If all organisms are on one physical continuum, then we should also be on the same moral continuum. … The only arguments in favour of painful experiments on animals are: 1) that the advancement of knowledge justifies all evils – well does it? 2) that possible benefits for our own species justify mistreatment of other species – this may be a fairly strong argument when it applies to experiments where the chances of suffering are minimal and the probability of aiding applied medicine is great, but even so it is still just ‘speciesism’, and as such it is a selfish emotional argument rather than a reasoned one.”

—  Richard D. Ryder

" Speciesism https://books.google.it/books?id=Rz30CgAAQBAJ&pg=PT59" (1970). Reported in Speciesism, Painism and Happiness: A Morality for the Twenty-First Century by Richard D. Ryder (Exeter: Imprint Academic, 2011), Chapter 2.

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British psychologist 1940

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