Western lowland gorillas (Gorilla gorilla gorilla) are highly social great apes. Providing appropriate social groups and environmental complexity is the foundation of their welfare in captivity.
Gorilla welfare in captivity hinges on social group quality and behavioral opportunity. Solitary housing causes severe psychological deterioration — gorillas are among the most socially dependent of all primates. Group composition must replicate natural social structures: single-silverback groups with compatible females and offspring produce the most stable, welfare-positive outcomes. Dietary welfare is a significant challenge — commercially produced gorilla diets are often too calorie-dense, causing obesity and cardiac disease. High-fiber browse-based diets that require prolonged processing time better match nutritional needs and provide behavioral enrichment simultaneously. R&R behavior — swallowing and bringing up food repeatedly — is a displacement behavior indicating stress or boredom, not digestive disorder. Facilities achieving low R&R rates through enriched environments and appropriate diet provide measurably better welfare.