Enrichment programs are central to modern zoo animal welfare. Scientific evidence about what forms of enrichment most effectively improve animal wellbeing guides best practice.
The science of zoo enrichment has matured significantly from the early days of simply adding novel objects to enclosures. We now understand that enrichment is most effective when it is specifically designed to engage the behavioral repertoire of the target species, when it provides agency and choice rather than passive novelty, and when it is regularly renewed to prevent habituation. Evaluating whether enrichment is actually improving welfare - through behavioral observation, cortisol monitoring, and validated welfare assessment frameworks - is increasingly standard in well-run facilities. The keeper relationship remains one of the most underappreciated forms of enrichment: animals who trust their keepers show lower baseline stress and can be trained to cooperate voluntarily with medical procedures.