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This article is part of an ongoing series on bioethics and modern moral philosophy.

Welfarists champion the "3Rs" (Replacement, Reduction, Refinement). They work to ensure lab monkeys have enrichment toys and that researchers use the smallest possible number of animals. Rightists demand an absolute end to vivisection, arguing that informed consent is impossible and that human benefit does not justify non-human harm. This article is part of an ongoing series

is a philosophical and abolitionist stance. It posits that animals have inherent moral worth independent of their utility to humans. Under this framework, animals have the right to live free from human interference, and their "use"—no matter how humane—is considered a violation of their fundamental rights. 2. The Philosophical Giants Rightists demand an absolute end to vivisection, arguing

Sentient animals have moral worth independent of their utility to humans. They possess a "right to life" that cannot be traded away for human gain. Under this framework, animals have the right to

exist in almost every developed nation. The UK's Protection of Animals Act (1911) and the US Animal Welfare Act (1966) punish overt cruelty like beating, starvation, or neglect. However, these laws specifically exempt "common agricultural practices." This is the "ag-gag" paradox: in many places, it is illegal to abuse a cat, but entirely legal to debeak a chicken without anesthetic because it is "standard practice."