A bizarre mystery unfolded on Jicarón Island as white-faced capuchins repeatedly abducted baby howler monkeys, showing no ...

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 ...

Biologists documented five male capuchin monkeys carrying at least eleven different infant howler monkeys -- a behavior never before seen in wild primates. Rise and spread: The sightings were remotely ...

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