Acknowledgements

We thank I. Vilchez,T. Fang, J. Moro, L. Moya I., F. Encarnación, and E. Montoya for their kind assistance. Logistical and financial support was provided by the Proyecto Peruano de Primatología 'Manuel Moro Sommo', Dirección Regional de Recursos Naturales y de Medio Ambiente - Loreto, the Amazon Conservation Fund, and the Chicago Zoological Society. Drs Kent H. Redford and Thomas T. Struhsaker are thanked for reviewing the manuscript.

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