Jacobsen and colleagues provided different forms of environmental enrichment to six old laboratory male tufted capuchin monkeys (Cebus apella). The research team studied the behavior of the monkeys during a baseline period and during three enrichment periods. When provided with enrichment, the monkeys began to exhibit behavioral profiles that more closely resembled those of their natural counterparts and engaged in natural, species-specific activities, suggesting that their psychological well-being had improved. These results also suggest that group housing combined with environmental enrichment can improve the welfare of old laboratory tufted capuchin monkeys that were previously housed individually.

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