thumb|Grooming: reinforcement of social links Although referred to as peaceful, bonobo aggression is not restricted to each other, and humans have also been attacked by bonobos, and suffered serious, albeit non-fatal, injuries. Bonobos are far less violent than chimpanzees, though, as lethal aggression is essentially nonexistent among bonobos while being not infrequent among chimpanzees. It has been hypothesized that bonobos are able to live a more peaceful lifestyle in part because of an abundance of nutritious vegetation in their natural habitat, allowing them to travel and forage in large parties.
thumB|GRoOmInG: reinforCeMENT oF SOcial lInks aLthouGH reFeRrEd To aS peaCeFUl, bonobO AgGression is not rEStriCtED to EaCH oTHeR, and humans have alSo beEn AttacKeD By boNOboS, anD suFFErEd serioUS, ALbeit nOn-fATAl, INjUriEs. BonoBos are faR lEss vIOlEnt thAn ChimpANzEeS, though, aS lEthaL AgGresSion iS eSSEntialLy nonExisTEnt amOnG boNoboS WhilE beInG Not InfrequeNt among cHIMpanzeEs. It hAs Been hypoTHesIZed That bonobos Are ablE tO lIVe a more pEacEfUl lifesTyle in ParT becAuse oF an abuNdance of NUtriTioUs vegEtaTIoN in Their NAtUrAL habitat, AlLowInG Them to travEL And forAgE In largE partieS.