title: Introduction: environmental enrichment.
authors.affiliation: Institute for Laboratory Animal Research, Washington, DC, USA.
authors.forename: Thomas L
authors.initials: TL
authors.lastname: Wolfle
mesh_terms: D000822:Animal Husbandry / Q000331:legislation & jurisprudence / Q000379:methods*; D000827:Animal Welfare / Q000639:trends*; D000818:Animals; D000830:Animals, Laboratory; D001522:Behavior, Animal; D006799:Housing, Animal / Q000592:standards*