One theme throughout Richard Dawkins’ career has been the criticism of apportioning moral concern and worth according to species boundaries. Like writers and philosophers before him, especially after Darwin, he consistently stresses the idea of a biological continuum that implies a moral continuum.
The idea is right there in his first book, The Selfish Gene, when he is deriding the exceptional status some give a foetus over an adult chimpanzee. In that passage he also notes the speciesist bigotries inherent in the ill-treatment of animals:
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The only thing more strongly forbidden by our culture is eating people (even if they are already dead).
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