Crawford, RJM, AB Makhado, L Upfold, and BM Dyer. “Short Communication<br><Br>Mass on Arrival of Rockhopper Penguins at Marion Island Correlated With Breeding Success”. African Journal of Marine Science 30, no. 1 (June 25, 2008): 185–188. Accessed November 8, 2026. https://www.ajol.info/index.php/ajms/article/view/33527.