- Utilitarian (animal "liberation")
- Based on the possession of a capacity to suffer
- Whether one's interests are promoted or thwarted is morally basic
- No principled objection to using animals as means to our ends so long as those ends are very significant and legitimately outweigh the interests of the animals when given full and equal consideration
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- Kantian (animal "rights)
- Based on being a subject of a life
- One's inherent value as a subject of a life with ends of its own is morally basic
- Objects in principle to using animals as means to our ends; morality prohibits such use even if such use would bring about states of affairs where more and more important interests were satisfied and fewer frustrated
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