Orangutan welfare in zoos requires exceptional environmental complexity that simulates the three-dimensional foraging challenges of tropical rainforest life.
Orangutan environmental complexity needs extend beyond physical space to cognitive challenge. An orangutan in a large but static exhibit without cognitive engagement may have worse welfare than one in a smaller but cognitively rich environment. Daily variation in foraging challenge - changing hiding locations, varying puzzle types, introducing novel objects and scents - prevents the habituation that reduces enrichment value over time. The most welfare-positive facilities treat enrichment as a skilled professional practice requiring planning, assessment, and continuous innovation rather than a box to tick.