. "Appendix A Samples of Nonhuman-Primate Environmental-Enhancement Plans." The Psychological Well-Being of Nonhuman Primates. Washington, DC: The National Academies Press, 1998.
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Individually housed primate infants or juveniles.
Individually housed primates that are unable to see or hear primates of their own or compatible species.
Nonhuman primates in psychological distress, as determined by behavior or appearance.
Nonhuman primates participating in approved animal study proposals which require restricted activity.
Great apes weighing more than 110 lbs (50 kg).
Nonhuman primates experiencing restraint for more than 12 hours are provided daily with the opportunity for unrestrained activity for at least 1 continuous hour during the period of restraint unless continuous restraint is required by an approved animal study protocol.
