We thank the Direction of Forestry and Fauna of the Agrarian Region XXII of Loreto for the permission and facilities to carry out censuses and explorations and to collect specimens. Our special thanks go to naturalist Pekka Soini for his valuable contributions and suggestions, to Dr. Jaime Moro Sommo, Technical Coordinator of the Sub-Station of IVITA in Iquitos for his unremitting support and inspiration, to Dr. Juan Enrique García Yuste of the Estación Biológica de Doñana in Sevilla (Spain) for critically reading the manuscript, and to Dr. Eckhard W. Heymann of the German Primate Center for the English translation. We are grateful to the field assistants of the Peruvian Primatological Project who shared their experience during field work, and to all other persons who contributed to the realization of this document. Finally, we express our most sincere gratitude to Ms. Teresa Gordon for her efficient typewriting of the manuscript.
This work was carried out within the framework of the Peruvian Primatological Project under the patronage of the Peruvian government and of the Pan American Health Organization.
