Contents -- Introduction -- CHAPTER 1. Beauty and the Beast: Darwin, Wallace, and the Animal-Human Boundary -- CHAPTER 2. Progressive Desire: Rational Evolution after the Great War -- CHAPTER 3. Branching Out, Scaling Up: American Experiments on Behavior -- CHAPTER 4. Courtly Behavior: The Rituals of British Zoologists -- CHAPTER 5. A Science of Rare Males: The Genetics of Populations in the Long 1960s -- CHAPTER 6. Selective History: Writing Female Choice into Organismal Biology -- Conclusion -- Acknowledgments -- Notes -- Essay on Sources -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- R -- S -- T -- V -- W -- Y -- Z.