Outdoor housing facilities.
CFR · 2024-01-01 · US · Title 9
(a) (b) (c) (d) (1) The outside walls of the primary enclosure are made of a sturdy, durable material such as concrete, wood, plastic, metal, or glass, and are high enough and constructed in a manner that restricts contact with or entry by humans and animals that are outside the housing facility; or (2) The housing facility is surrounded by a natural barrier that restricts the nonhuman primates to the housing facility and protects them from contact with unauthorized humans and animals that are outside the housing facility, and the Administrator gives written permission. (e)
official document · source cfr-2024 · id 9:§ 3.78