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 ...

Sept. 18 -- It turns out monkeys, like people, are no fools when it comes to equal pay for equal work. A new study found when brown capuchin monkeys noticed their partners were getting a better reward ...

Monkeys who showed a steeper rise in these stress hormones during the mild droughts were more likely to survive the severe El Nino drought. As weather intensifies globally, longitudinal studies of how ...

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 ...

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 ...