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Figure 2.
Box plots showing faecal glucocorticoid metabolite (fGCM) levels in tufted capuchin monkeys during provisioning periods in which food was either clumped or dispersed and for individuals with different propensities to produce deceptive false alarm calls. Values on the y-axis are the residuals of a null model that included only the control variables included in the reduced model in Table 2 (i.e. all variables except caller type, experimental condition and the interaction between these two variables; see Methods). Values greater than zero indicate fGCM levels higher than predicted by the null model, while those less than zero are lower than predicted. Box plots as in Fig. 1. N = 269 fGCM samples from 20 individuals.