Biologist at the University of Costa Rica Oscar M. Chaves Badilla is a primate specialist studying a phenomenon that seems to appear almost exclusively in Costa Rica. That is the discoloration of ...

Howler monkeys are relatively small primates known for their incredibly loud, low-frequency roars that sound as if they come from a much larger creature. This is useful in the animal kingdom because ...

Observations of Coiba’s tool-using immature capuchin monkeys show them carrying abducted infant howler monkeys. What is the reason for this behavior? Vanessa Crooks Caught in the act! Capuchin monkeys ...

The research group from the University of Costa Rica (UCR), led by Dr. Óscar M. Chaves, has been investigating the unusual coloration in howler monkeys (Alouatta palliata) from 2021 to 2023. Typically ...

Male capuchin monkeys on a Panamanian island were documented carrying around infant howler monkeys for no clearly discernible reason. By Elizabeth Landau Capuchin monkeys don’t generally hang out with ...

In a recent study, scientists report that howler monkeys in Costa Rica make longer calls in forest interiors and near naturally occurring forest edges, such as those along rivers, than near ...

Part I. Introduction. 1. Why is it important to continue studying the behavioral ecology and conservation management of howler monkeys? / Martín M. Kowalewski, Paul A. Garber, Liliana Cortés-Ortiz, ...