'Anthony Rylands and his contributors have provided primatology with an updated theme-oriented approach to callitrichid biology which, without doubt, (1) represents an unrivalled comparative synthesis of our understanding of the systematics, ecology and behaviour of this primate (sub)family, and (2) will become the starting point of many a research hypothesis concerning the causes and adaptive functions of callitrichid biology over the next 10 years and beyond. The book is remarkable in terms of the amount of information and interpretations and hypotheses that it contains.'Christopher Pryce, Universität Zürich, Primate eye, No. 53, June 1994