Kozlowski, Corinne P, Helen Clawitter, Frank Fischer, Amanda Bender, Anne Tieber, Ashley Franklin, Mary Jo Willis, and David Powell. “Patterns of Faecal Hormone Metabolites Associated With Reproduction in Cinereous Vultures Aegypius Monachus”. Journal of Zoo and Aquarium Research 11, no. 3 (July 31, 2023): 329–335. Accessed July 19, 2024. https://www.jzar.org/jzar/article/view/739.