Arthur Kingsley Porter Professor of Philosophy (Harvard University) Christine Korsgaard delivers the first of three Uehiro Lectures at the University of Oxford in December 2014. Lecture One: Animals, Human Beings, and Persons Legitimate differences in the ways we treat animals, human beings, and other entities that have moral or legal rights – legal persons – must be based on the differences between them. Philosophers have traditionally cited a variety of factors – rationality, sentience, having interests – as morally significant. In this lecture I discuss what the morally relevant similarities and differences between these kinds of entities might be.