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The 1985 amendments to the United States Animal Welfare Act amendments directed the Secretary of Agriculture to establish regulations to provide an adequate physical environment to promote the psychological well-being of primates and exercise for dogs.  Subsequent standards for nonhuman primate environmental enhancement (including provisions for social grouping and environmental enrichment) are included under Section 3.81 in the Animal Welfare Regulations (9 CFR). Concepts relating to behavioral needs and environmental enrichment are also incorporated into the standards for marine, flying, and aquatic mammals.