Kinship is an important organizing factor in the structuring of female-female social relationships. Particularly in larger groups, females preferentially associate with, groom, and provide coalitionary support to their matrilineally related female kin. They do not exhibit a similar preference for their paternal half sisters, which may mean that they only are capable of recognizing kinship through the maternal line. Dominance rank is also an important organizing factor, with females more often grooming and associating with females who are closer to them in the dominance hierarchy. Female-female dyads groom far more than male-female and male-male dyads. Coalitionary aggression is common both among males and females, and capuchins seem to have an excellent understanding of the alliance structure in their group. For example, when capuchins are fighting, they sensibly recruit aid from someone who is both higher ranking than they are and also better friends with themselves than with their opponent.