Bonobos for years have had the reputation of being the cool hippies of the simian world, with a "make love, not war" ethos, ...

A new study of chimpanzee and bonobo groups at zoos reveals similar levels of aggression. However, scientists found stark sex-based differences between the species.

Chimpanzees have a reputation for being aggressive, while bonobos are often seen as their peaceful counterparts. This contrast has frequently been used to explain different sides of human nature.

For years, anthropologists have watched wild chimpanzees "go ape" and attack each other in coordinated assaults. But until now, scientists were unsure whether interactions with humans had brought on ...

Chimpanzees have a reputation for being aggressive, while bonobos are often seen as their peaceful counterparts. This contrast has frequently been used to explain different sides of human nature.

Historically considered a more peaceful species than their chimpanzee cousins, bonobos are actually just as aggressive -- but ...

Aggression in the animal world can be tricky to define. Some animals may seem harmless in one moment and highly dangerous in ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. A new study finds chimp and ...