Certainly, the human-animal distinction is still workable; after all, we rarely make errors in assigning entities to one category or the other. But a… - Steve Stewart-Williams

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Certainly, the human-animal distinction is still workable; after all, we rarely make errors in assigning entities to one category or the other. But after Darwin, the distinction suddenly seems arbitrary – as arbitrary as the equally workable distinction between, say, turtles and non-turtles.