Over the last few decades a rich literature has developed on ethics and animals. In this seminar we will discuss in detail two of the most substantial recent works: Christine Korsgaard's, 2018 book, Fellow Creatures: Our Obligations to the Other Animals, and Shelly Kagan's 2019 book, How to Count Animals, more or less. In addition to discussing theoretical issues in this domain, we will also address the practical consequences of the views under discussion. Please note: This seminar will be taught jointly by Alice Crary (NSSR) and Dale Jamieson (NYU) and will be open to students at NYU as well as NSSR. The meetings of the seminar will be held, alternately, at NYU and NSSR. Arrangements have been made for Christine Korsgaard to visit the seminar, it is possible that Shelly Kagan will visit as well.