 However, more recent observations have shown variation in structure and the number of males within groups, with one species forming multi-male, multifemale groups in a multilevel society, and in some populations supergroups form exceeding 500 individuals.There appears to be a dominant male, whilst there is no clear dominance among female members.Relationships among females are considered to be resident-egalitarian, as there is low competition and aggression between them within their own groups.