 Here, Korsgaard understands “reason” as “a kind of reflective success” and given that non-humans are thought to be unable to reflect in a way that would allow them this sort of success, it appears that they do not act on reasons, at least reasons of this kind. Since non-humans do not act on reasons they do not have a practical identity from which they reflect and for which they act. So humans can be distinguished from non-humans because humans, we might say, are sources of normativity and non-humans are not.