The first edition of Frans de Wall's book Politics in Chimpanzees: Power and Sex in Primates was well received not only by primatologists for its scientific achievements, but also by politicians, business leaders and social psychologists for its deep understanding of the most basic human needs and behavior of people. A quarter of a century later, the book has come to be considered a classic. Together with a new introduction that outlines the author's most recent ideas, this anniversary edition contains a detailed account of rivalries and coalitions among great apes—actions guided by intelligence rather than instinct. By showing that chimpanzees act as if they had read Machiavelli, de Waal reminds us that the roots of politics are much older than humans. The book is addressed to a wide range of readers.