This book explores whether or not animals have moral rights through a number of different lenses, including classical deontology, libertarianism, commonsense morality, virtue ethics, and utilitarianism, while also addressing the challenges to the strong animal rights position posed by rights nihilism, the "kind" argument against animal rights, the problem of predation, and the comparative value of lives. This book also explores the practical import of animal rights from both a personal and social policy standpoint.