The effects of enrichment structures on captive gorilla behavior (2003)

Allard, S. M., Stoinski, T. S., Bloomsmith, M. A. et al.

Abstract

Tree-like structures were constructed in two of the outdoor gorilla exhibits at Zoo Atlanta. .. Juveniles used the structures significantly more than did adult animals (Mann-Whitney U = 3.0, p = 0.01). However, certain behaviors, such as feeding and object examination, decreased in frequency.