Bonobos have long been thought of as "hippie chimps" in conservation circles because of their supposedly peaceful nature, notes the New York Times. A comprehensive new study, however, appears to have ended that.
- The stats: Researchers found that male bonobos were nearly three times as likely as chimpanzees to engage in an act of aggression, reports the Guardian. They logged 521 aggressive acts (hitting, pulling, biting, kicking, etc.) over 2,047 hours of tracking in the Democratic Republic of Congo, compared to 654 aggressive acts over 7,309 hours for chimps. (Bonobos are tougher to track in the wild.)