Related: Endangered Langur Monkey Baby Arrives at Oklahoma City Zoo Other video viewers would like to believe that these are cases of animal adoption, but sadly this is not the case.

Observations of Coiba's tool-using immature capuchin monkeys show them carrying abducted infant howler monkeys. What is the reason for this behavior?

A handful of male capuchin monkeys have been caught on camera abducting babies from another species, baffling the scientists who study them. Over a 15-month period, five male capuchins were seen ...

A group of capuchin monkeys has evolved a terrifying new habit on a remote island off the coast of Panama: kidnapping young howler monkeys. What started as an anomaly, a single young man carrying an ...

Camera trap footage from Jicarón Island revealed a male capuchin monkey carrying a howler infant on its back. Now, scientists are trying to understand what's driving this kidnapping behavior ...

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

Scientists studying camera trap footage from Jicarón Island spotted something unusual: a capuchin monkey carrying an infant howler monkey on his back. Now, they’re trying to learn what it means.

A group of male capuchin monkeys kidnapped baby howler monkeys – a different species – on a small island of Panama. Video shows the howler monkeys clinging to the male capuchin monkeys ...

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

Scientists studying footage from Jicarón Island spotted something unusual: a capuchin monkey carrying an infant howler on his back. Now, they’re trying to learn what it means.

Scientists spotted surprising evidence of what they describe as monkey kidnappings while reviewing video footage from a small island of Panama. The capuchin monkeys were seen carrying at least 11 ...

Scientists spotted surprising evidence of what they describe as monkey kidnappings while reviewing video from a small island of Panama.