9 C.F.R. § 3.128 Space requirements.
Title 9 - Animals and Animal Products
Enclosures shall be constructed and maintained so as to provide sufficient space to allow each animal to make normal postural and social adjustments with adequate freedom of movement. Inadequate space may be indicated by evidence of malnutrition, poor condition, debility, stress, or abnormal behavior patterns.
Title 9: Animals and Animal Products
PART 3—STANDARDS
Subpart F—Specifications for the Humane Handling, Care, Treatment, and Transportation of Warmblooded Animals Other Than Dogs, Cats, Rabbits, Hamsters, Guinea Pigs, Nonhuman Primates, and Marine Mammals
Facilities and Operating Standards
§ 3.128 Space requirements.
