Researchers have discovered a weird, new behavior among capuchin monkeys, and it involves kidnapping howler monkey infants.

The scientists nicknamed one capuchin kidnapper Joker because the scar at the side of its mouth reminded them of the "Batman" ...

Scientists studying footage from Jicarón Island spotted something unusual: a capuchin monkey carrying an infant howler on his ...

Violeta the baby spider monkey is beginning a new chapter at the Oakland Zoo after she was rescued by authorities during a ...

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.” ...

A new trend is catching on among bored young male capuchins: kidnapping baby howler monkeys, in what scientists say is the ...

Scientists working on Jicarón Island noticed that the Capuchin monkey population had started to ‘kidnap’ younger monkeys of ...

Male capuchin monkeys on a Panamanian island were documented carrying around infant howler monkeys for no clearly discernible reason.

Plus, researchers could hear adult howler monkeys calling back and forth with the infants, who would sometimes try to crawl away. Camera footage showed one occasion when an adult howler came and tried ...

Capuchins are also known for developing odd social rituals across their range. Scientists studying mainland populations have ...

Scientists on Panama's Jicarón Island were mystified by photos and videos of young male capuchins carrying howler monkeys on their backs for days at a time ...