ผลศึกษาล่าสุด ชิมแพนซีมีการพัฒนาการและระบบสังคม คล้ายคนครับ อ่านแล้วลองแปลความนิด ว่านี่คือ “การแต่งงาน” หรือ “การซื้อบริการทาง***” 
the_therapist writes
A team from the Max Planck Institute for Evolutionary Anthropology in Germany, studied chimps in the Tai Forest reserve in Ivory Coast and discovered that chimpanzees enter into ‘deals’ whereby they exchange meat for sex. Among the findings are that ‘male chimps that are willing to share the proceeds of their hunting expeditions mate twice as often as their more selfish counterparts.’ They also found this to be ‘a long-term exchange, so males continue to share their catch with females when they are not fertile, copulating with them when they are.’