The behavioral response of individually caged baboons to feeding enrichment and the standard diet: A preliminary report (1995)

Brent, L., Long, K. E.

Abstract

PVC pipe with finger holes, filled with a mixture of peanut butter and seeds. The mean amount of feeder use was 51 minutes per 60 minute observation sessions. Increasing foraging opportunities in this study reduced abnormal behaviors from 16.4% of the data points in the baseline condition to 4.9% and 5.7% in the chow [normal feeding condition] and feeder condition, respectively.