Preface; Introduction: Primate feeding ecology: an integrative approach Martha M. Robbins and Gottfried Hohmann; Part I. Field Studies: Introduction Peter S. Rodman; 1. Variability of the feeding ecology of eastern gorillas Martha M. Robbins, John Bosco Nkurunungi and Alastair McNeilage; 2. Sympatric western gorilla and mangabey diet: reexamination of ape and monkey foraging strategies Diane M. Doran-Sheehy, Natasha F. Shah and Lisa A. Heimbauer; 3. Effects of fruit scarcity on foraging strategies of sympatric gorillas and chimpanzees Juichi Yamagiwa and Augustin Kanyunyi Basabose; 4. Chimpanzee feeding ecology and comparisons with sympatric gorillas in the Goualougo Triangle, Republic of Congo David Morgan and Crickette Sanz; 5. Frugivory and gregariousness of Salonga bonobos and Gashaka chimpanzees: the abundance and nutritional quality of fruit Gottfried Hohmann, Andrew Fowler, Volker Sommer and Sylvia Ortmann; 6. Feeding ecology of savanna chimpanzees (Pan troglodytes verus) at Fongoli, Senegal Jill D. Pruetz; 7. Food choice in Tai chimpanzees: are cultural differences present? Christophe Boesch, Zoro Bertin Gone Bi, Dean Anderson and Daniel Stahl; 8. The effects of food size, rarity, and processing complexity on white-faced capuchins' visual attention to foraging conspecifics Susan Perry and Juan Carlos Ordonez Jimenez; Part II. Testing Theories: Introduction Richard W. Wrangham; 9. Primate foraging adaptations: two research strategies Stuart A. Altmann; 10. The predictive power of socioecological models: a reconsideration of resource characteristics, agonism, and dominance hierarchies Andreas Koenig and Carola Borries; 11. Hunger and aggression in capuchin monkeys Charles Janson and Erin Vogel; 12. How does food availability limit the population density of white-bearded gibbons? Andrew J. Marshall and Mark Leighton; 13. Influence of fruit availability on Sumatran orangutan sociality and reproduction Serge A. Wich, Martine L. Geurts, Tatang Mitra Setia and Sri Suci Utami-Atmoko; 14. Central place provisioning: the Hadza as an example Frank W. Marlowe; Part III. Analyzing nutritional ecology: Introduction Katharine Milton; 15. Estimating the quality and composition of wild animal diets - a critical survey of methods Sylvia Ortmann, Brenda J. Bradley, Caroline Stolter and Jorg U. Ganzhorn; 16. The possible application of novel marker methods for estimating dietary intake and nutritive value in primates Robert W. Mayes; 17. Energy intake by wild chimpanzees and orangutans: methodological considerations and a preliminary comparison Nancy Lou Conklin-Brittain, Cheryl D. Knott and Richard W. Wrangham; 18. The role of sugar in diet selection in redtail and red colobus monkeys Lisa Danish, Colin A. Chapman, Mary Beth Hall, Karyn D. Rode and Cedric O'Driscoll Worman; 19. Primate sensory systems and foraging behavior Nathaniel J. Dominy, Peter W. Lucas and Nur Supardi Noor.