Thompson, Lindy J., John P. Davies, Gareth Tate, and Colleen T. Downs. “Captive Large Predators Killing Vultures: Exposing Captive Facilities As an Additional Source of Mortality to Highly Threatened Birds”. Bothalia, African Biodiversity & Conservation 50, no. 1 (July 16, 2020). Accessed November 26, 2020. http://abcjournal.org/index.php/BothaliaABC/article/view/170.