Environmental enrichment and behavioral engineering for captive primates (1979)

Markowitz, H.

Abstract

Food dispensing apparatuses were developed and successfully implemented as feeding enrichment options for group-housed gibbons, siamangs and diana monkeys. Frequently, often with free food in their hands, they [gibbons] attempted to get the lights and levers to respond and missed the opportunity to 'produce' food. The problem of excess food lying around and decaying on the floor had been reduced to a minimum.