Environmental enrichment is one of the most evidence-rich areas of animal welfare science, showing consistently that complex environments improve physical and psychological outcomes.
Environmental enrichment science provides one of the strongest evidence bases in all of animal welfare research. Across species ranging from octopuses to elephants, providing complex, stimulating environments with opportunities for natural behaviour consistently improves welfare outcomes. The mechanisms are now well understood: enriched environments activate reward pathways, reduce chronic stress, promote physical health, and support normal behavioural development. What constitutes enrichment is species-specific and must be informed by natural history - what opportunities does this animal have in the wild, and how can we approximate them in captivity? Enrichment that is repetitive, predictable, or irrelevant to the species fails to deliver welfare benefits. Novel, challenging, and species-appropriate enrichment is most effective.