A contrast between flourishing lives and impeded lives is a core idea of this book. It is at the very heart of the concept of justice, or so I will argue in chapter 1. And thinking well about this contrast is a key to developing a good theory of justice for animals. What is wrong with the three leading theories on this topic, I’ll argue, is that they do not pay attention to this contrast and the diverse ways it turns up in the diverse lives animals lead.
