Allogrooming given correlates with allogrooming received. Allogrooming giving is plotted against allogrooming received for dyads that did not share food ((a) n = 214, r = 0.62, p < 0.0002) and dyads that did share food ((b) n = 98, r = 0.81, p < 0.0002). On non-trial days, dyads that shared food both gave and received more allogrooming than non-sharing dyads (F1,310 = 32.9 and 41.0, p < 0.0002 for both).