“Zoo Visitors’ Perceptions of Chimpanzee Welfare Are Not Affected by the Provision of Artificial Environmental Enrichment Devices in a Naturalistic Exhibit”. Journal of Zoo and Aquarium Research 5, no. 1 (January 31, 2017): 56–61. Accessed September 16, 2026. https://jzar.org/jzar/article/view/250.