of new patterns. We hope that by viewing the video clips carefully as well as reading the glossary, researchers at other sites will discover much new material for discussing the behavioral diversity of chimpanzees living in the natural environment. Rich flesh will be put on the bones of Table 1 and full interpretation will be given only after detailed information is gathered in many other sites, in particular, for Pan troglodytes troglodytes and P. t. vellerosus and Pan paniscus. Acknowledgments We thank Tanzania Commission for Science and Technology, Tanzania Wildlife Research Institute, and Tanzania National Parks for permission to do the field research, and Mahale Mountains National Park and Mahale Mountains Wildlife Research Centre for logistic support. Our gratitude goes to Hosea Y. Kayumbo, Costa Mlay, George Sabuni,