Do animals have moral rights? If so, which ones? How does this affect our thinking about agriculture and experimentation? If animals have moral rights, should they be protected by law? These are some of the questions addressed in this collection, which contains more than 30 papers spanning nearly 40 years of debates about animal rights. It includes work by leading advocates of animal rights both in philosophy and law, as well as contributions by those resolutely opposed to the very idea of animal rights. A substantial Introduction surveys key arguments in the area and puts the papers in context.