Decades of zoo enrichment research has generated evidence on what types of enrichment most effectively improve animal welfare, with some surprising findings about complexity, novelty and preference.
Enrichment research has moved zoo practice from 'providing enrichment' as a checkbox activity to evidence-based programmes targeting specific behavioural needs. The evidence shows that effective enrichment requires understanding species ecology, providing sensory and feeding stimulation matched to natural behaviour, ensuring novelty through rotation, and monitoring animal responses to measure effectiveness. Poorly designed enrichment - items that are too easy, never changed, or inappropriate for the species - provides minimal welfare benefit despite satisfying public perception that animals are 'enriched.' Zoos committed to evidence-based enrichment publish data on enrichment use, stereotypic behaviour rates and animal preference tests.