Foerder, Preston, Sally B. Swanson, and David Collins. “Space Use and Enrichment in a North American River Otter (Lontra Canadensis) Exhibit”. Journal of Zoo and Aquarium Research 8, no. 2 (April 30, 2020): 94–98. Accessed April 19, 2024. https://jzar.org/jzar/article/view/402.