"Professor Varner’s earlier work, In Nature's Interests? (Oxford University Press 1998), is a very fine book. It has achieved a high level of respect from those working in the field, and is often seen as having set a new standard of debate in environmental ethics. That means that a new book by Professor Varner will be received with considerable interest. "Varner draws on extensive recent empirical research regarding the degree to which animals are self-conscious and uses this information as the basis for the most serious discussion I have yet seen of whether any nonhuman animals can be considered 'persons'. "There is, to my knowledge, no other book that goes into these issues anywhere near as deeply, in the context of assessing their significance for the normative issues of the wrongness of taking life, or other issues relating to ethical decision-making regarding our treatment of animals and some humans. I have no doubt that this book will, like In Nature's Interests?, be seen as making an important contribution to the topics it covers." Peter Singer, University Center for Human Values, Princeton University Available from Oxford University Press in May of 2012.