Western lowland gorillas are the most commonly kept great ape in accredited zoos. Their welfare depends on highly complex social management, extensive foraging enrichment, and naturalistic habitat design that challenges most facilities.
Gorilla welfare in captivity is shaped by the extraordinary cognitive and social complexity of these animals. Social hierarchy management within a group is the single most important welfare factor: inter-male conflict, competition over females, and social instability cause chronic psychological stress measurable through cortisol and behavioural indicators. The silverback-centred group structure means that transfers of any individual can destabilise an entire group for months. Enrichment for gorillas must address their highly varied natural foraging repertoire — scatter feeding alone is insufficient; browse, gum-producing logs, seasonal variation in diet, and cognitive problem-solving devices all contribute. Heart disease in male gorillas is a welfare crisis that has driven research into dietary and exercise interventions, including reduced caloric density foods and physical enrichment that promotes activity.