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Orangulas: effect of scheduled visual enrichment on behavioral and endocrine aspects of a captive orangutan (Pongo pygmaeus): effect of scheduled visual enrichment on behavioral and endocrine aspects of a captive orangutan. JZAR [Internet]. 2020 Jan. 31 [cited 2026 Sep. 16];8(1):67-72. Available from: https://jzar.org/jzar/article/view/416