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Visitors are known to affect zoo animals, and such effects may be stressful, neutral, or enriching. The majority of research has focused on visitor number or visitor presence–absence, yet few studies have examined effects of other variables such as sound volume, visitor activity, and whether visitors interact with animals. In this study, the effects of visitor number, activity and proximity to animals were investigated on a group of captive orangutans in two treetop, ‘free-ranging’ exhibits at Singapore Zoo. Multinomial logistic regressions were used to elucidate the relationships between visitor and orangutan behaviours. Results from these analyses revealed a significant overall effect of the three visitor variables on orangutan behaviour. Interestingly, visitor number had little effect on the orangutans, except at one of the exhibits where the likelihood of food soliciting and looking at visitors increased when the number of …