Enrichment programmes in modern zoos have transformed from simple toys to evidence-based behavioural science interventions that can dramatically improve captive animal welfare.
Zoo enrichment science has advanced from an informal 'give them toys' approach to a rigorous discipline that measures behavioural outcomes and validates welfare improvements. Effective enrichment engages species-typical motivational systems — predatory behaviour in carnivores, foraging in ungulates, problem-solving in primates — rather than simply providing novel objects. The welfare gain from well-designed enrichment is measurable: animals show fewer stereotypies, more diverse behaviour, and better physical condition. Enrichment failure occurs when items are too simple, too frequent, or miss the motivational target.