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| Author's Acknowledgments | ||
| Author's Preface to the English Edition | ||
| Translator's Preface | ||
| Figures and Maps | ||
| Tables | ||
| 1 | Why Study Chimpanzees? | 1 |
| Parallels with Ourselves | 1 | |
| The Discovery of Chimpanzees | 17 | |
| The Place of Pygmy Chimpanzees | 22 | |
| Special Features of Pygmy Chimpanzees | 26 | |
| A Brief History of Field Research | 34 | |
| 2 | Distribution | 39 |
| The Historical Record | 39 | |
| Research in Recent Decades | 41 | |
| Ecological Conditions | 49 | |
| Population Size and Density | 58 | |
| Factors Determining Distribution and Density | 59 | |
| Comparison with Common Chimpanzees | 62 | |
| 3 | Social Groups and Social Patterns | 67 |
| Four Patterns | 67 | |
| The Unit Group and Fission and Fusion | 70 | |
| Wamba's E-Group | 76 | |
| Environmental Pressures and Physical Abnormalities | 82 | |
| Comparison with Common Chimpanzees | 89 | |
| 4 | Food and Nutrition | 93 |
| The Variety of Foods | 93 | |
| Principal Foods and Seasonal Changes | 96 | |
| Taste | 102 | |
| Food Culture | 105 | |
| Nutritional Value | 108 | |
| Comparison with Common Chimpanzees | 113 | |
| 5 | Behavior of Individuals | 116 |
| Daytime Behavior | 116 | |
| Daily Travel Distance and Home Range | 119 | |
| Habitat Utilization | 120 | |
| Searching for Food | 122 | |
| Nest-Making | 126 | |
| Comparison with Common Chimpanzees | 135 | |
| 6 | Sexual Behavior | 138 |
| The Role and Diversity of Sex | 138 | |
| Copulation | 139 | |
| Reactions of Others | 145 | |
| The Development of Mating | 149 | |
| Frequency of Copulation | 150 | |
| Comparison with Common Chimpanzees | 154 | |
| 7 | Social Behavior and Social Relationships | 163 |
| Kin Relationships | 163 | |
| Relationships Between Adult Males | 175 | |
| Relationships Between Adult Males and Females | 184 | |
| Relationships Between Adult Females | 189 | |
| Immature and Adolescent Social Relationships | 196 | |
| Relationships Between Groups | 203 | |
| Comparison with Common Chimpanzees | 204 | |
| 8 | Why are Pygmy Chimpanzees Interesting? | 210 |
| Appendixes | 223 | |
| References Cited | 235 | |
| Index | 245 |
Overview