References
USDA Animal Welfare Act Regulations And Standards,, Section 3.81 (Environment Enhancement To Promote Psychological Well-Being)
From the USDA Animal Welfare Act Regulations and Standards,, Section 3.81 (Environment enhancement to promote psychological well-being)-
“Dealers, exhibitors, and research facilities must develop, document, and follow an appropriate plan for environment enhancement adequate to promote the psychological well-being of nonhuman primates. The plan must be in accordance with the currently accepted professional standards as cited in appropriate professional journals or reference guides, and as directed by the attending veterinarian. This plan must be made available to APHIS upon request, and, in the case of research facilities, to officials of any pertinent funding agency.”