Effects of environmental enrichment on behavioural changes were studied in five captive sloth bears kept in confined enclosure at Zoological Park, Chennai, India. Behavioural categories like active, passive, and abnormal behaviours were taken for the study. The activity budget was recorded as a single animal scan. The detailed baseline data of 150 hours, over a period of 30 days, were collected. At baseline, bears exhibited passive and more abnormal behaviours. Similarly, after application of the environmental tools like honey-log, underground food pipes, and wobbling box in the enclosure, the data were collected for 150 hours (30 days). Increased active behaviours and decreased abnormal behaviours were observed and showed highly significant changes in the abnormal behaviour as a whole when compared to the baseline level. During the postenrichment period, the data that were collected for 150 hours (30 days) showed no significant differences statistically between the behavioural categories. But certain level of difference was evident from the percentage of abnormal behaviours exhibited by individual bears. Among the enrichment devices, honey-log was the most preferred enrichment tool as revealed by the percentage of time spent by individual animal. The results show that application of enrichment tool continuously may bring long term effect in stereotypic behaviour. 1. Introduction Bears are large, impressive, extremely popular zoo animals and the subject of considerable folklore [1]. Among them sloth bears (Melursus ursinus) are widely distributed on the Indian subcontinent and on the Islands of Sri Lanka [2]. Zoos have responsibility to provide the best possible house for animals living in restricted environments [3]. The purpose may be to increase the natural habitat, to increase behavioural diversity and number of normal behavioural patterns, to reduce the frequencies of abnormal behavior, to increase reproductive success, or to make them more visible to the public [4, 5]. Most of the bear species kept under captivity exhibited abnormal behaviours because of the small enclosures in the zoos [6]. This greatly reduced the opportunity to exhibit its natural behaviour [7]. Bears kept in such barren environments show an overall decrease in interaction with the environment that tends to perform stereotypies [8]. Stereotypies are high repetitive uniform sequences of behaviour, which seem to be of no functional value to the animals [9]. However, the barren environments are not the unique reason for stereotypies. Age, husbandry procedures [10], rearing
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