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While comparative research on this topic is naturally hampered by the inability of non-human animals, and often humans, to clearly and readily communicate about their internal states, the following observations can be stated unequivocally:
And that capacity belongs to human beings alone (although there may be some minimal moral agency evident in some animal species and hardly any in some damaged humans but borderline cases do not defeat but support such a general point).
Donald Marshall: “Sepheroth 75”: