He then argued that if humans have rights , more essentially , animals have also rights after critical examination of existing moral theories humans themselves formulated that provided them the acknowledgment of their rights . He concluded that it is through this that we can also acknowledge animal rights . Peter Singer : ``All Animals are Equal ' The argument of Regan is further sustained in Peter Singer 's ``All Animals are Equal ' in James Rachels ' ``The Right Thing to Do : Basic Readings in Moral Philosophy...











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