Jarvis, K. A., Gould, J. E. 2007. Effects of a complex enrichment device on stereotypic behaviors, tool use, tool manufacturing
As a way to reduce abnormal behaviors, specifically finger-sucking, hair-pulling, and reingestion/regurgitation, observed in two male gorillas at The ZOO Northwest Florida, a complex enrichment device that was contingent on the gorilla's ability to use...