Learmonth, Mark James, Sally Sherwen, and Paul Hemsworth. “Assessing Choice Ability and Preferences of Five Leopard Tortoises (Stigmochelys Pardalis) for Three Stimuli through a Novel Two-Phase Preference Test”. Journal of Zoo and Aquarium Research 9, no. 2 (April 30, 2021): 94–101. Accessed April 26, 2024. https://www.jzar.org/jzar/article/view/540.