Movements of a wild night monkey (Aotus trivirgatus) -- Overview of the Mesoamerican Primate Fauna, Primate Studies, and Conservation Concerns -- Taxonomy and Biogeography -- Introduction: Taxonomy and Biogeography -- Taxonomy and Distributions of Mesoamerican Primates -- The Biogeographic History of Mesoamerican Primates -- Population Responses to Disturbance -- Introduction: Population Responses to Disturbance -- Demographic Features of Alouatta pigra Populations in Extensive and Fragmented Forests -- Population Structure of Black Howlers (Alouatta pigra) in Southern Belize and Responses to Hurricane Iris -- The Effects of Forest Fragment Age, Isolation, Size, Habitat Type, and Water Availability on Monkey Density in a Tropical Dry Forest -- Forest Fragmentation and Its Effects on the Feeding Ecology of Black Howlers (Alouatta pigra) from the Calakmul Area in Mexico -- Intestinal Parasitic Infections in Alouatta Pigra in Tropical Rainforest in Lacandona, Chiapas, Mexico: Implications for Behavioral Ecology and Conservation -- Behavior and Ecology -- Introduction: Behavior and Ecology -- Average Body Weight for Mantled Howling Monkeys (Alouatta palliata): An Assessment of Average Values and Variability -- An Exploratory Analysis of Developmental Plasticity in Costa Rican Mantled Howler Monkeys (Alouatta palliata palliata) -- Travel Patterns and Spatial Mapping in Nicaraguan Mantled Howler Monkeys (Alouatta palliata) -- Use of Landmark Cues to Locate Feeding Sites in Wild Capuchin Monkeys (Cebus capucinus): An Experimental Field Study -- Leap, Bridge, or Ride? Ontogenetic Influences on Positional Behavior in Cebus and Alouatta -- Food Choice by Juvenile Capuchin Monkeys (Cebus capucinus) in a Tropical Dry Forest -- Why Be Alpha Male? Dominance and Reproductive Success in Wild White-Faced Capuchins (Cebus capucinus) -- Post-conceptive Mating in White-Faced Capuchins, Cebus capucinus: Hormonal and Sociosexual Patterns of Cycling, Noncycling, and Pregnant Females -- Conservation and Management Policies -- Introduction: Conservation and Management Policies -- Growth of a Reintroduced Spider Monkey (Ateles geoffroyi) Population on Barro Colorado Island, Panama -- Primates in Agroecosystems: Conservation Value of Some Agricultural Practices in Mesoamerican Landscapes -- Primate Populations in the Protected Forests of Maya Archaeological Sites in Southern Mexico and Guatemala -- Mapping Primate Populations in the Yucatan Peninsula, Mexico: A First Assessment -- A Metapopulation Approach to Conserving the Howler Monkey in a Highly Fragmented Landscape in Los Tuxtlas, Mexico -- Quantifying Fragmentation of Black Howler (Alouatta pigra) Habitat after Hurricane Iris (2001), Southern Belize -- Synopsis and Perspectives -- New Perspectives in the Study of Mesoamerican Primates: Concluding Comments and Conservation Priorities.