Reinhardt, V. 1990. A perch for caged macaques. Humane Innovations and Alternatives in Animal Experimentation 4, 134-135.

Wooden and plastic perches have been tested successfully by several hundred rhesus monkeys and 40 stump-tailed monkeys of both sexes and various ages over the last 3 years. Perches have proven an inexpensive, simple, yet effective environmental enrichment for these species. Perches are particularly attractive for animals during the daily cleaning of their cages because they offer a dry, comfortable place to sit while the floors of their cages are sprayed with water.