This book represents a remarkable achievement. Cohen manages to review all the major current areas of research in chimpanzee studies, something no other book has hitherto attempted to do. What's more, he does this in his easy-to-read, catchy style - he is a well known science writer - which swings the reader along from page to page. We learn as we go along. There is a lot happening in the world of our closest living relatives. It's an area of enquiry that has burgeoned from its early beginnings with the works of Robert Yerkes, author of "Almost Human" published in 1925. Cohen nicely counters the idea that chimps are almost human with a series of telling chapters that show that chimpanzees, while almost human in the sense that they are our nearest relatives in the animal kingdom, are not at all human in a number of ways, just as we humans are not chimpanzees.
Cohen looks at chimps in their natural habitats, across Africa. He visits many of the sites where chimp research is going on and interviews the fieldworkers he finds out there. From this we see the chimpanzee as a distinct species, living a complex social life and communicating in ways we are only just beginning to understand. He moves into the area of language studies, showing that chimps cannot learn human language, and why should they? They have their own system of communication that baffles us. As he shows, the heroic efforts of psychologists to teach chimpanzees human language have only served to underline their distinct nature as another, very intelligent species, sensitive and with feelings and emotions like our own, but nevertheless not human.
He is at home in the field of genetics, exploring why the numerically small difference in the genomes of humans and chimps is realized in the emergence of two very distinct species. Page after page is crammed with facts. This book could serve as a textbook for undergrads, indeed it would get them to the heart of many a complex problem in less time than conventional text books do. For the general reader it offers deep insights into the story of the search for an AIDS vaccine, a billion dollar failure of human medical science. He writes about the genetics of speech and the crucial differences between humans and chimpanzees which enable us to speak where chimps fail.
All the writing is done by reference to the people behind the science. Cohen has visited more chimp scientists than I've had hot dinners. He has talked to them, asked them key questions, faithfully recorded what they had to say. It all comes out, including the many, many differences of opinion between competing researchers. The dirty washing hangs out alongside the clean. The chimps are named too, a long roll-call of famous individuals. Their plight in the wild is spotlit, together with those who have tried and are trying to save them from extinction.
All in all this is a great book and should in my opinion be given a science book prize. There is nothing like it out there, with Cohen's unique combination of scientific accuracy and easy style.
Vernon Reynolds (Oxford, UK)