This book is a philosophically sophisticated and scientifically well-informed discussion of the moral and social issues raised by genetically engineering animals, a powerful technology that has major implications for society. Unlike other books on this emotionally charged subject, the author attempts to inform, not inflame, the reader about the real problems society must address in order to manage this technology. Nontechnical and anecdotal in nature, written by a professor of philosophy, physiology and biophysics, this book will appeal to both specialists and general readers with an interest in genetic engineering.