Mary Midgley is one of the most important moral philosophers working today. Over the last thirty years, her writings have informed debates concerning animals, the environment and evolutionary theory. The invited essays in this volume offer critical reflections upon Midgley's work and further developments of her ideas. The contributors include many of the leading commentators on her work, including distinguished figures from the disciplines of philosophy, biology, and ethology. The range of topics includes the moral status of animals, the concept of wickedness, science and mythology, Midgley's relationship to modern moral philosophy, and her relationship with Iris Murdoch. It also includes the first full bibliography of Midgley's writings. The volume is the first major study of its kind and brings together contributions from the many disciplines which Midgley's work has influenced. It provides a clear account of the themes and significance of her work and its implications for ongoing debates about our understanding of our place within the world.