Measurement of enrichment device use and preference in singly caged baboons (1998)

Hienz, R. D., Zarcone, T. J., Turkkan, J. S. et al.

Abstract

The present experiment employed both observational data and miniaturized, electronic activity monitors attached to the enrichment devices to precisely measure their use. ... When average device movement times were compared, baboons generally interacted less with Kongs than with logs or swings. This trend, however, was not consistent for each individual animal. Of the six baboons, three clearly preferred the log (i.e., moved the log more than the other two devices), two preferred the swing, and one preferred the Kong. Thus the trends expressed in the averaged data can be quite misleading.