Heidegger argues in his work Being and Time that humans are distinguished from other beings by their capacity to put their own existence into question. They are the creatures for whom existence as such, not just particular features of it, is problematic. This or that situation might prove problematic for a warthog, but – so the theory goes – humans are those peculiar animals who confront their own situation as a question, quandary, source of anxiety, ground of hope, burden, gift, dread, or absurdity. And this is not least because they are aware, as warthogs presumably are not, that their existence is finite. Human beings are perhaps the only animals who live in the perpetual shadow of death.