If we accept that humans are not the only animals with personalities, not the only animals capable of rational thought and problem solving, not the only animals to experience joy and sadness and despair, and above all not the only animals to know psychological as well as physical suffering, we become (I hope) less arrogant, a little less sure that we have the inalienable right to make use of other life-forms in any way we please so long as there is a possible benefit for human animals. We are, of course, unique but we are not so different from the rest of the animal kingdom as we used to
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