General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms  Stress-coping related behaviours were grouped in to five factors using PCA. Restless and Self-protection are similar to proactive and reactive coping strategies. The other factors were Self-narcotize, Sterotyped, Helpseek. None of the factors showed sex differences. with 28 behavioural categories, we employed Principal Component Analysis to explore differences in 36 behaviour potentially indicative of stress (BPIS) in a sample of 123 captive brown capuchins. We 37 identified five principal components summarising BPIS and labelled as: Restless, Self-38 narcotizing/fear, Self-protection, Stereotyped, and Help-seek. Multivariate GLM and regression 39 analyses indicated no sex differences. It was not possible to map the five components onto the five 40 personality dimensions recently described for capuchins. However, two of the patterns (Restless and 41Self-protection) parallel the two coping strategies described in several other species (Proactive and 42Reactive), and may reflect stress-reactivity that is conserved across species. 43 44

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