Spider monkeys are highly intelligent, arboreal primates of the Americas with complex social needs. Their welfare in zoos requires large, complex enclosures and appropriate social grouping.
Spider monkey welfare depends critically on enclosure design that accommodates brachiation. Short enclosures that prevent arm-swinging locomotion cause frustration and stereotypic behavior. Their fission-fusion social system means social housing must provide enough space for subgroup formation and reunion -- animals that cannot modulate social contact through distance and separation suffer elevated stress. Enrichment should focus on foraging challenges at height and social interaction opportunities. Their intelligence requires environmental complexity and novelty. Behavioral monitoring specifically tracking brachiation frequency provides a useful welfare indicator.