Part I. - Introduction
1. The Evolution of Gibbons and Siamang
Reichard U.H., Barelli C., Hirai H. & Nowak M.G.
2. The Role of Historical and Fossil Records in Predicting Changes in the Spatial Distribution of Hylobatids
Chatterjee H.J.
3. Locomotion and Posture in Ancestral Hominoids Prior to the Split of Hylobatids
Nowak M.G. & Reichard U.H.
4. The Fossil Record and Evolutionary History of Hylobatids
Harrison, T.
5. Climate and Geography of Asia: Miocene to Pleistocene
Reichard U.H. & Croissier M.M.
Part II. - Gibbon and Siamang Phylogeny
6. Unique evolution of heterochromatin and alpha satellite DNA in small apes
Koga A. & Hirai H.
7. Phylogeny and Classification of Gibbons (Hylobatidae) Roos C.
Part III. - Evolution of Gibbon and Siamang Morphology and Locomotion
Reichard U.H. & Preuschoft H.
9. Gibbons to Gorillas: Allometric Issues in Hominoid Cranial Evolution
Leslie E.R. & Shea B.T.
10. Nowak M.G. & Reichard U.H.
11. Selective Value of Characteristic Size Parameters in Hylobatids. A Biomechanical Approach to Small Ape Size and Morphology.
Preuschoft H., Sch?newasser K.-H. & Witzel U.
Part IV. - Gibbon and Siamang Cognition
12. Hand Manipulation Skills in Hylobatids
Prime J.M. & Ford S.
13. The Evolution of Technical Intelligence: Perspectives from the Hylobatidae
Cunningham C.L., Anderson J.R. & Mootnick A.R.
14. Communication and Cognition of Small Apes
Liebal K.
15. Gibbon songs: Understanding the Evolution and Development of this Unique Form of Vocal Communication
Koda H.