Candidate traditions were documented across three communities of wild spider monkeys (Ateles geoffroyi) using an a priori approach to identify behavioral variants and a statistical approach to examine differences in their proportional use. This methodology differs from previous studies of animal traditions, which used retrospective data and relied on the 'exclusion method' to identify candidate...

The cervical vertebral column bears or balances the weight of the head supported by the nuchal muscles that partly originate from the cervical vertebrae. The position of the head relative to the vertebral column, and consequently locomotion and posture behavior, could thus be associated with the form of the cervical vertebrae. In spite of this assumption and some empirical indications along the...

We examined the association between geographic distribution, ecological traits, life history, genetic diversity, and risk of extinction in nonhuman primate species from Costa Rica. All of the current nonhuman primate species from Costa Rica are included in the study; spider monkeys (Ateles geoffroyi), howling monkeys (Alouatta palliata), capuchins (Cebus capucinus), and squirrel monkeys (Saimir...

In species with a high degree of fission-fusion dynamics group members may differ in the use of the group home range to reduce food competition. Such differential use may result in distinct individual core areas. We studied core area quality and overlap among 21 female spider monkeys belonging to the same group over a period of 4 years. Core areas ranged between 62 and 161 ha with a mean overla...

El “gato de Geofroy” (Leopardus geoffroyi) es un pequeño felino las regiones subtropicales y templadas América del Sur, cuya actividad principalmente nocturna. Su dieta está compuesta por pequeños mamíferos aves paseriformes. Es considerado depredador oportunista, lo que lagartos anfibios también suelen ser foco sus ataques. Presentamos el primer registro documentado depredación Micrurus pyrrho...

Federal do Rio Grande do Sul, Porto Alegre 91501-970, Rio Grande do Sul, Brazil, e-mail: , Maria Fernanda Iurck, Núcleo de Estudos do Comportamento Animal, Pontifícia Universidade Católica do Paraná (PUCPR/CNPq), Rua Imaculada Conceição 1155, Caixa Postal 16210, Curitiba 81611-970, Paraná, Brazil, Sérgio L. Mendes, Departamento de Ciências Biológicas – CCHN, Universidade F...

This paper demonstrates the use of stable isotope ratios of carbon and nitrogen in animal tissue for indicating aspects of species behavioral strategy. We analyzed hair from individuals representing four species of New World monkeys (Alouatta palliata, the mantled howler; Ateles geoffroyi, the spider monkey; Cebus capucinus, the capuchin; and Brachyteles arachnoides, the woolly-spider monkey or...