“…Usually, members of a unit stay close together, while the extent of cohesion becomes smaller as the social level increases (Grueter et al, 2012;Maeda et al, 2021;Papageorgiou et al, 2019;Qi et al, 2014;Snyder-Mackler et al, 2012). Some studies have found that different units keep an intermediate distance from each other, staying farther apart than the inter-individual distance within units (Bowler et al, 2012), but closer than random distribution (Maeda et al, 2021). It is argued that this differentiation of social relationships has evolved to balance the advantages of being a large-group and the disadvantages of resource competition with other units (Moscovice et al, 2020;Rubenstein and Hack, 2004;.…”