Reviewed by: Are We Smart Enough to Know How Smart Animals Are? by Frans de Waal John Skalko Are We Smart Enough to Know How Smart Animals Are? by Frans de Waal (New York: W. W. Norton, 2016), 340 pp. Frans de Waal's 2016 Are We Smart Enough to Know How Smart Animals Are? is an exciting read into the baffling and brilliant world of what goes on inside non-human animal heads. Given the sheer number of studies published in the late twentieth century on animal cognition, de Waal does an amazing job presenting many of them in a highly readable fashion with just enough detail to understand the importance and rigorous facets of the research (or in some cases not so rigorous), but without making the detail overwhelming. The extensive bibliography at the end of the book provides ample material for any curious reader interested in further research regarding any of the scientific studies. Much of what is presented in the book would present a big challenge for any contemporary Cartesians who may hold, as Descartes did, that animals are mere automata. If non-human animals are self-moving machines devoid of cognition, then how do chimpanzees learn to stack boxes high enough to reach objects overhead? De Waal tells the famous story of Sultan the chimpanzee who accomplished such a feat without any prior training or teaching (65). Further, if non-human animals have no emotions, then what of the two bottlenose dolphins who came to the rescue of a third after the explosion of a stick of dynamite (133)? De Waal's book presents many challenges for the Cartesian mechanistic view of animals. Most people today, however, need not be persuaded that that the Cartesian view is wrong. On a popular level the overwhelming view is that there is no significant difference in kind between the cognition of non-human [End Page 309] animals and that of man. It is this view that de Waal himself espouses throughout the book, and for which he provides much evidence, although at times his phrasing sounds a bit like dogmatic worship of Darwin. Nevertheless, if Darwin is right, he is right. And given the contemporary biological and psychological courses of study, Darwin appears to be the most reasonable view. But an older, middle view, between the extremes of Cartesian automata and Darwinian cognitivism has been forgotten by many scholars. This is the view of the Aristotelian tradition. Aristotle held a more nuanced view of animal cognition: animals are not mere machines devoid of cognitive states, but neither do they possess all of the same kind of mental faculties that man has—"In all animals other than man there is no thinking or calculation but only imagination."1 In the footsteps of Aristotle, Avicenna and Aquinas also did much to develop a rich account of animal cognition. De Waal seems to be completely unaware of the middle ground of the Aristotelians concerning animal cognition. Most of the case studies de Waal mentions remain perfectly compatible with the Aristotelian tradition (albeit, perhaps in its more developed forms): ravens have cognitive perspective-taking (147–48); apes imitate other apes (153–54); thrushes cognize ahead in gathering food for their young (205–6); rats remember in which part of a maze they encountered chocolate before (211); and wasps recognize the faces of other wasps (70–71). But various challenges remain for the Aristotelian. De Waal provides various cases of what he takes to be reasoning in non-human animals. Many of these cases are not reasoning in the Aristotelian sense: reasoning (for the Aristotelian) is coming to know another proposition from two prior propositions that are known. De Waal mentions Sadie, a chimpanzee who could cognize when a box had a fruit in it and when another box did not: [The experimenters] placed an apple in one [box] and a banana in another. After a few minutes of distraction, Sadie saw one of the experimenters munching on either an apple or a banana. This experimenter then left, and Sadie was released to inspect the boxes. She faced an interesting dilemma, since she had not seen how the experimenter had gotten...