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

At first, behavioral ecologist Zoë Goldsborough thought the small figure seen on the back of a capuchin monkey in her camera ...

A capuchin named Joker started the apparent trend, leading researchers to suspect "there was something a little quirky about ...

Plus, researchers could hear adult howler monkeys calling back and forth with the infants, who would sometimes try to crawl ...