" Whatever characteristic we identify as possessed only by humans will not be possessed by all humans. Some humans will have the exact same deficiency that we attribute to animals, and although we may not allow such humans to drive cars or attend universities, most of us would shut out the prospect of enslaving such humans, using them as unconsenting subjects in biomedical research, or otherwise using them exclusively as a means to an ends. "

― Gary L. Francione , Introduction to Animal Rights: Your Child or the Dog?