Effects of cage size on abnormal behavior in rhesus monkeys (2002)

Kaufman, B. M., Pouliot, A. L., Tiefenbacher, S. et al.

Abstract

Eight male rhesus monkeys .. were individually housed initially in spacious [barren] pens. They were then moved to [barren] baboon cages which were placed inside their pen. They remained in baboon cages for two years after which they were returned to their pens. Abnormal behaviors, including self-bite, hair pull and pace, did not change.