"A brilliant, concise statement of the argument for attributing basic rights to animals, and a significant new contribution to the current debate. Ms. Cavalieri shows that contemporary discussions in ethics and bioethics risk arbitrariness or incoherence because they have failed to tackle the issue of the status of animals. From now on, opponents of animal rights must try to answer Ms. Cavalieri's argument, and anyone writing in bioethics will have to meet her challenge."--Peter Singer, Princeton University