Tom Regan ( The Case for Animal Rights ), Peter Singer (utilitarian approach, though he argues for equal consideration of interests rather than "rights" per se).
Gary Francione, a leading rights theorist, coined the term to criticize groups like the Humane Society of the United States (HSUS) for negotiating with factory farms. He argues that campaigning for bigger cages distracts from the moral imperative: to stop eating eggs entirely. Tom Regan ( The Case for Animal Rights
Originating from the 1965 Brambell Report, the define the essential needs of animals under human care: hunger/thirst management, comfort, health, freedom to express normal behavior, and freedom from fear [1, 8, 16, 21]. 3. Evolving Standards: Beyond Welfare to Wellbeing Peter Singer (utilitarian approach