Another aspect is identified by Karin Gayer when mentioning the parallel evolution of the patriarchal hierarchy in the story 's society and the social matriarchy , the first resembling Chimpanzee communities and the second those of Bonobos . Another aspect is identified by Karin Gayer when pinpointing the parallel evolution of the patriarchal hierarchy in the narrated society and the alluded social matriarchy , the first resembling Chimpanzee communities and the second representing those of Bonobos .