Table 1. Proposed hypotheses regarding the function of impartial interventions in rhesus macaques.

Hypothesis	Benefit to intervener	Benefit to group	Dyads policed
group stability	reduced fighting & trauma	reduced fighting & trauma	all sex-dyads targeted equally
dominance assurance	reinforce individual rank	no benefit	males: mm females: ff
mating benefits	increased chance of mating	no benefit	males: ff or mf; females: mm or mf