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Sherley RB, Makhado AB, Crawford RJM, Hagen C, Kemper J, Ludynia K, Masotla MJ, McInnes A, Pichegru L, Tom D, Upfold L, Waller LJ 2024. The African Penguin Spheniscus demersus should be considered Critically Endangered. Ostrich 95 (3)
Sherley RB, Ludynia K, Lamont T, Roux J-P, Crawford RJM, Underhill LG 2013. The initial journey of an Endangered penguin: implications for seabird conservation. Endangered Species Research 21 89-95
Berruti A, Underhill LG, Shelton PA, Moloney C, Crawford RJM 1993. Seasonal and interannual variation in the diet of 2 colonies of the Cape Gannet (Morus capensis) between 1977-78 and 1989. Colonial Waterbirds 16 1977 – 1978
Crawford RJM, Williams AJ, Randall RM, Randall BM, Berruti A, Ross GJB 1990. Recent population trends of Jackass Penguins Spheniscus demersus off southern Africa. Biological Conservation 52 (3) 229 – 243
Crawford RJM, Shelton PA, Berruti A 1983. Cape Cormorants as potential indicators of pelagic fish stocks off southern Africa. South Africa Journal of Science 79 466-468

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