Humans aren't the only ones who hate a bum deal, it turns out. In a recent study, brown capuchin monkeys trained to exchange a granite token for a cucumber treat often refused the swap if they saw ...

A howler monkey infant, only a few days old, clings to a subadult white-faced capuchin monkey as it uses tools. Brendan Barrett / Max Planck Institute of Animal Behavior In June 2022, while ...

Howler infant number 5 on the back of a juvenile capuchin carrier, who is using stone tools at an anvil site in a stream bed. CREDIT: Brendan Barrett / Max Planck Institute of Animal Behavior.

But, if the behavior spreads to other capuchin groups or continues to impact howlers, which are an endangered species on Jicarón, it could become a conservation issue in Coiba National Park.

whose members are often called Capuchin monks. They wear a brown pointed hood called a capuccino. Those friars with the brown hoods were familiar to the European explorers who visited the forests ...

His team tested eight female brown capuchin monkeys in pairs. They could choose a token that gave only themselves a treat or an option that rewarded both of them, called a prosocial option.

What was the experiment about? The brown capuchin monkey, which has been regarded as one of the smartest New World monkeys, has become the subject of amazing research at Yale University.

Humans may not be alone in their demand for fair pay, according to a study of brown capuchin monkeys (Cebus apella). Sarah F. Bronson and Frans B.M. de Waal at the Yerkes National Primate Research ...