The document discusses the history and modern state of the animal rights movement. It notes that ancient philosophers like Pythagoras and Aristotle debated the moral status of animals. Modern animal rights philosophy emerged in the 1970s led by thinkers like Peter Singer, Tom Regan, and Gary Francione. While laws now prevent cruelty, animals are still considered property without full rights under the law. Major advocacy groups like PETA argue animals should not be used for food, clothing, experiments or entertainment.