Part I. Introduction. 1. The evolution of gibbons and siamang / Ulrich H. Reichard, Claudia Barelli, Hirohisa Hirai and Matthew G. Nowak ; 2. The role of historical and fossil records in predicting changes in the spatial distribution of hylobatids / Helen J. Chatterjee ; 3. Locomotion and posture in ancestral hominoids prior to the split of hylobatids / Matthew G. Nowak and Ulrich H. Reichard ; 4. The fossil record and evolutionary history of hylobatids / Terry Harrison ; 5. Hylobatid evolution in paleogeographic and paleoclimatic context / Ulrich H. Reichard and Michelle M. Croissier
Part II. Gibbon and siamang phylogeny. 6. Unique evolution of heterochromatin and alpha satellite DNA in small apes / Akihiko Koga and Hirohisa Hirai ; 7. Phylogeny and classification of gibbons (Hylobatidae) / Christian Roos
Part III. Evolution of gibbon and siamang morphology and locomotion. 8. Why is the siamang larger than other hylobatids? / Ulrich H. Reichard and Holger Preuschoft ; 9. Gibbons to gorillas : allometric issues in hominoid cranial evolution / Erin R. Leslie and Brian T. Shea ; 10. The torso-orthograde positional behavior of wild white-handed gibbons (Hylobates lar) / Matthew G. Nowak and Ulrich H. Reichard ; 11. Selective value of characteristic size parameters in hylobatids. A biomechanical approach to small ape size and morphology / Holger Preuschoft, K.-H. Schönwasser and Ulrich Witzel
Part IV. Gibbon and siamang cognition. 12. Hand manipulation skills in hylobatids / Jacqueline M. Prime and Susan M. Ford ; 13. The evolution of technical intelligence : perspectives from the Hylobatidae / Clare L. Cunningham, James R. Anderson and Alan R. Mootnick ; 14. Communication and cognition of small apes / Katja Liebal ; 15. Gibbon songs : understanding the evolution and development of this unique form of vocal communication / Hiroki Koda.