The authors thank Mr. Lenor Mandu for technical assistance and Dr. Hector Seuánez for revising the manuscript.
This work was supported by the following Brazilian Institutions: UFPA (Universidade Federal do Pará), FINEP (Financiadora de Estudos e Projetos), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnol6gico), FADESP (Fundação de Amparo e Desenvolvimento da Pesquisa); as well as by the Peruvian Proyecto Peruano de Primatologia. "Manuel Moro Sommo", which is developed by the Dirección General Forestal y de Fauna of the Ministry of Agriculture in collaboration with the Instituto Veterinário de Investigaciones Tropicales y de Altura of the Universidad Nacional Mayor de San Marcos, and the Instituto Nacional de Salud of the Ministry of Health. Additional support came from the Pan American Health Organization/World Health Organization, and the National Institutes of Health (USA).
