Chapter 1 Introduction: Definitions, Background

Chapter 2 Competition for Limiting Resources, Hamilton’s Rule, and Chesson’s R*

Chapter 3 Flexible and Derived Varieties of Mammalian Social Organization: Promiscuity in Aggregations May Have Served as a Recent “Toolkit” Giving Rise to “Sexual Segregation,” Polygynous Social Structures, Monogamy, Polyandry, and Leks

Chapter 4 Multimale-Multifemale Groups and “Nested” Architectures: Collaboration Among Mammalian Males

Chapter 5 Higher “Grades” of Sociality in Class Mammalia: Primitive Eusociality

Chapter 6 Ecological Models as Working Paradigms for “Unpacking” Positive and Negative Interactions Among Social Mammals

Chapter 7 Mechanisms Underlying the Behavioral Ecology of Group Formation

Chapter 8 The Evolution of Mammalian Sociality by Sexual Selection

Chapter 9 Proximate Causation: Functional Traits and the Ubiquity of Signaler to Receiver Interactions: From Biochemical to Whole Organism Levels of Mammalian Social Organization