Catering to caterrhines: Food enrichment at the University of Washington's Regional Primate Research Center (1998)

Bellanca, R. U., Crockett, C. M., Johnson-Delaney, C. et al.

Abstract

As simple and relatively inexpensive form of enrichment each animal received a treat (e.g., fruit, vegetable, exposure to foraging device) on 4 days per week. This costs about $0.50 per macaque or baboon per week.