the suggestion that they treat people whom they do not think of as human as if they were human. When utilitarians tell them that all pleasures and pains felt by members of our biological species are equally relevant to moral deliberation, or when Kantians tell them that the ability to engage in such deliberation is sufficient for membership in the moral community, they are incredulous. They rejoin that these philosophers seem oblivious to blatantly obvious moral distinctions, distinctions that any decent person will draw. Much of humanity is similarly offended by the suggestion that the moral community be extended to nonhumans. Nonhumans do possess some moral status in many societies, but it generally extends only to protection against what Cavalieri calls "wanton cruelty". Anti-speciesists state that the extension of moral membership to all humanity, regardless of individual properties such as intelligence, while denying it to nonhumans, also regardless of individual properties, is internally inconsistent. According to the argument from marginal cases, if infants, the senile, the comatose, and the cognitively disabled (marginal-case human beings) have a certain moral status, then nonhuman animals must be awarded that status too since there is no morally relevant ability that the marginal-case humans have that nonhumans lack. American legal scholar Steven M. Wise states that speciesism is a bias as arbitrary as any other. He cites the philosopher R.G. Frey (1941–2012), a leading animal rights critic, who wrote in 1983 that, if forced to choose between abandoning experiments on animals and allowing experiments on "marginal-case" humans, he would choose the latter, "not because I begin a monster and end up choosing the monstrous, but because I cannot think of anything at all compelling that cedes all human life of any quality greater value than animal life of any quality." "Discontinuous mind" Richard Dawkins, the evolutionary biologist, wrote against speciesism in The Blind Watchmaker (1986), The Great Ape Project (1993), and The God Delusion (2006), elucidating the connection with evolutionary theory. He compares former racist attitudes and assumptions to their present-day speciesist counterparts. In the chapter "The one true tree of life" in The Blind Watchmaker, he states that it is not only zoological taxonomy that is saved from awkward ambiguity by the extinction of intermediate forms but also human ethics and law. Dawkins states that what he calls the "discontinuous mind" is ubiquitous, dividing the world into units that reflect nothing but our use