In contrast, the animal rights perspective, most famously articulated by philosopher Tom Regan, argues that animals are "subjects-of-a-life." They possess inherent value, consciousness, desires, memory, and a sense of the future. Because of this, they have fundamental rights—most notably, the right not to be treated as property. Peter Singer, though technically a preference utilitarian rather than a rights theorist, famously argued in Animal Liberation that the capacity to suffer, not intelligence or species membership, is the currency of moral consideration (a concept called "speciesism").
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: Reduction, Replacement, Refinement, and Responsibility in animal testing. Animal Rights In contrast, the animal rights perspective, most famously