Assessing the cost-effectiveness of specific enrichment items for captive chimpanzees (1992)

Dewey, R. A. J.

Abstract

The results show that the raisin blocks and the probing boards stimulated the most activity, followed in descending order by browse and burlap, boxes and seeds. ... Adult chimpanzees engaged in foraging behaviours, but rarely did they interact with the boxes and burlap, whereas the young chimpanzees were active in using boxes and burlap, but did not engage in foraging activity. ... Essentially, the only limiting factor in providing appropriate cost-effective enrichment is one's own imagination.