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.

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

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 target their ire most often at males, according to a study published ...

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.

Chimps in the wild engage in deadly battles with rival troops to increase their reproductive success, suggests new research. The Ngogo chimps of Uganda’s Kibale National Park have long been known for ...

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 ...

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