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Crawford RJM, Williams AJ, Hofmeyr JH, Klages NTW, Randall RM, Cooper J, Dyer BM, Chesselet Y 1995. Trends of African Penguin Spheniscus demersus populations in the 20th-century. South African Journal of Marine Science 16 (1) 101-118
Siegfried WR, Frost PGH, Cooper J, Kemp AC 1976. South African Red Data Book - Aves.. South African National Science Programmes Report 7 1 - 108
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South African Red Data Book_Aves.pdf 1.83 MB
Frost PGH, Siegfried WR, Cooper J 1976. Conservation of the Jackass Penguin (Spheniscus demersus (L)). Biological Conservation 9 79 - 99
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Conservation of the Jackass Penguin.pdf 1.81 MB
Siegfried WR, Frost PGH, Kinahan JB, Cooper J 1975. Social behaviour of Jackass Penguins at sea. Zoologica africana 10 (1) 87 - 100
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Social behaviour of Jackass Penguins at sea.pdf 2.56 MB

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