Enrichment — providing animals with stimuli that promote natural behaviours and positive mental states — is a cornerstone of modern zoo welfare. The science of enrichment is maturing rapidly, moving from intuition to evidence.
The science of zoo enrichment has advanced significantly from its origins as ad hoc novelty provision. Evidence-based enrichment design now considers species-specific sensory modalities, natural foraging strategies, social needs, and cognitive capacities. The most effective programmes treat enrichment as an ongoing experimental process — observing animal responses, measuring stereotypy reduction and positive behaviour increases, and adjusting accordingly. A key insight from enrichment science is that the process of obtaining a resource is often more valuable than the resource itself: foraging challenges that replicate wild search patterns are more engaging than passive food delivery. Modern zoo welfare uses enrichment not as a welfare supplement but as a primary tool for achieving positive psychological states.