You may have watched more than once monkeys frolicking and spinning on trees, and it turns out that there is an interesting explanation for this.
In a current study, researchers found that adolescent chimpanzees are very similar to human teenagers, and even manage to be nicer than them.
Young chimpanzees and human teens share risk-taking behaviors, American psychologists and anthropologists find.
The researchers also state that they're "confident that the early archeological sites from Brazil may not be human-derived but may belong to capuchin monkeys."