Primatologist Susan Perry of UCLA has spent much of the past 35 years studying the complex social lives of white-faced capuchin monkeys, at a field site she established in one of the remaining patches ...

BAHÍA DRAKE, Puntarenas — For a significant portion of our recent Deep Dive to the Southern Zone, I felt as if I had been inserted into the “Planet Earth” nature documentary. That idea resonated ...

Shelly Ladd prepared the diets for 159 diabetic monkeys like she typically does on Sunday mornings. Ladd, 66, cleaned up from concocting the diets around 10:30 a.m. when a Jungle Friends Primate ...

Here a white-faced capuchin monkey perches on a tree branch in Manuel Antonio National Park in Costa Rica. A group from the same genus has been observed with stolen howler monkey babies on a small ...

Acacia trees in Costa Rica have an obligate mutualism with three species of Pseudomyrmex ants, which vigorously defend their host tree from insect and mammalian herbivores. Depending on the size and ...

An arboreal lifestyle is thought to be central to primate origins, and most extant primate species still live in the trees. Nonetheless, terrestrial locomotion is a widespread adaptation that has ...