Signs of enrichment: Towards the psychological well-being of chimpanzees (1989)

Fouts, R. S., Abshire, M. L., Bodamer, M. D. et al.

Abstract

By providing the chimpanzees with a wide variety of things to do we have also created an environment that is conducive to interesting social interaction. This is exactly the type of environment one would expect to help a chimpanzee achieve some measure of psychological well-being. While the chimpanzees benefit by having an enriched and stimulating environment in which they can play and manipulate objects, science also benefits by having healthy chimpanzees to study.