Cognitive enrichment programmes for zoo gorillas provide mental stimulation that reduces stereotypic behaviour and improves psychological wellbeing in captive great apes.
The cognitive complexity of gorillas means that understimulating environments cause significant psychological harm. Captive gorillas without adequate enrichment show high rates of stereotypic behaviour including repeated rocking, pacing, and regurgitation-reingestion, which are recognised indicators of poor psychological welfare. Enrichment that activates natural foraging, problem-solving, and social behaviours dramatically reduces these indicators. Accredited zoos treat enrichment not as a luxury but as a fundamental welfare requirement, and welfare audits include assessment of enrichment provision and effectiveness.