Individual study: Observations of increased activity and tool use in captive rhesus monkeys exposed to troughs of water
Parks K.A. & Novak M.A. (1993) Observations of increased activity and tool use in captive rhesus monkeys exposed to troughs of water. American Journal of Primatology, 29, 13-25
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Primates: Present food in water (including dishes and ponds)
A replicated, before-and-after study in 1993 in the USA (Parks & Novack 1993) found that, when exposed to water-filled troughs, rhesus monkeys Macaca mulatta were more active compared to when troughs of water were absent. On average the number of times exploratory behaviour occurred increased from five, when there was no water trough present, to six when the trough was present, to four once the trough had been removed in two social groups of monkeys. Water was either standing or running and was contained in plastic troughs. For each of the two social groups, behavioural data was collected for 15 days every five minutes between the hours of 09:00 h and 10:00 h for each of the tests where no trough was present, where the trough was present with water and afterwards where no trough was present again. (CJ)