Jerome, C. P., Szostak, L. 1987. Environmental enrichment for adult, female baboons (Papio anubis). Laboratory Animal Science 37, 508-509 (Abstract).

Each baboon was placed in a cage with another baboon for 3-4 hours, two or three times per week. The same pairs consistently visited each other in either animal's cage. Although some baboons had previously been single-caged without socialization for at least one year, no significant aggression occurred during visiting.