We humans value a great variety of plant and animal species for their usefulness to us. But what is the value-if any-of a species that offers no practical use? In the face of accelerating extinctions across the globe, what ought we to do? Amid this sea of losses, what is our responsibility? How do we assess the value of nonhuman species? In this clear-spoken, passionate book, naturalist and philosopher Edward L. McCord explores urgent questions about the destruction of species and provides a new framework for appreciating and defending every form of life. The book draws insights from philosophy, ethics, law, and biology to arrive at a new way of thinking about the value of each species on earth. With meticulous reasoning, McCord demonstrates that the inherent value of species to humanity is intellectual: individual species are phenomena of such intellectual moment-so interesting in their own right-that they rise above other values and merit enduring human embrace. The author discusses the threats other species confront and delineates the challenges involved in creating any kind of public instrument to protect species. No other scholar has advocated on behalf of biodiversity with such eloquence and passion, and none provides greater inspiration to defend nonhuman forms of life.