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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, Crawford RJM, de Blocq AD, Dyer BM, Geldenhuys D, Hagen C, Kemper J, Makhado AB, Pichegru L, Upfold L, Visagie J, Waller LJ, Winker H 2020. The conservation status and population decline of the African penguin deconstructed in space and time. Ecology and Evolution 10 (15) 8506-8516
Crawford RJM, Makhado AB, Whittington PA, Randall RM, Oosthuizen WH, Waller LJ 2015. A changing distribution of seabirds in South Africa—the possible impact of climate and its consequences. Frontiers in Ecology and the Environment Review Article
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A changing distribution of seabirds in South Africa_2015.pdf 2.47 MB
Crawford RJM, Altwegg R, Barham BJ, Barham PJ, Durant JM, Altwegg R 2014. Age-specific survival and movement among major African Penguin Spheniscus demersus colonies. IBIS 156 (4) 716-728
Crawford RJM, Altwegg R, Barham BJ, Barham PJ, Durant JM, Dyer BM 2011. Collapse of South Africa's penguins in the early 21st century. African Journal of Marine Science 33 (1) 139-156

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