On the other hand, in this study, looking at three «subspecies» of common chimpanzees, «we found significant genetic variation,» said Przeworski, «but there's very little detectable difference between the populations in terms of appearance or behavior.» (uchospitals.edu)
Common chimpanzee groups are manifestly patriarchal. (newscientist.com)
Then around 2.5 million years ago, bonobos and common chimpanzees went their separate ways. (newscientist.com)