Hmm, the user didn't specify a tone, but for a long, authoritative article, a balanced, informative, and persuasive yet respectful tone works best. I should avoid being overly emotional or preachy. The structure needs to be logical: start by defining the terms, then explore their histories, key differences, practical applications (like factory farming and animal testing), legal perspectives, cultural debates, and end with a forward-looking synthesis.

is a philosophical and social movement that argues animals are not property. They are sentient beings with inherent value—what philosopher Tom Regan called "subjects-of-a-life." Rights advocates argue that animals possess basic moral rights, most notably the right not to be used as a resource by humans.