Behavioral effects of a change in the physical environment: a pilot study of captive chimpanzees (1982)

Clarke, A. S., Juno, C. J., Maple, T. L.

Abstract

A group of chimpanzees was translocated from a laboratory environment to a naturalistic man-made island. Stereotyped and self-directed behaviors were dramatically reduced on the island. There were also increases in social play and social grooming. The animals showed a preference for elevated structures.