A capuchin named Joker started the apparent trend, leading researchers to suspect "there was something a little quirky about him, or that he was kind of lonely in a way.” ...

Credit: Christian Ziegler/Brendan Barrett / Max Planck Institute of Animal Behavior/Cover Images A capuchin monkey named ‘Joker’ has sparked a bizarre and cruel fad among his kind on an island off the ...

On Panama’s Jicarón island, biologists documented five male capuchin monkeys carrying at least eleven different infant howler ...

Big trucks and a fan-favorite monkey are taking over Milwaukee this weekend, while a cultural festival sets up shop in ...