| Population trends in British breeding birds JH Marchant British Trust for Ornithology, 1990 | 758 | 1990 |
| Collapse of South Africa's penguins in the early 21st century RJM Crawford, R Altwegg, BJ Barham, PJ Barham, JM Durant, BM Dyer, ... African Journal of Marine Science 33 (1), 139-156, 2011 | 218 | 2011 |
| Population dynamics of the African Penguin Spheniscus demersus at Robben Island, South Africa RJM CRAWFORD, LJ SHANNON, PA WHITTINGTON Marine Ornithology 27, 139-147, 1999 | 120 | 1999 |
| Mortality and survival of African Penguins Spheniscus demersusinvolved in the Apollo Seaoil spill: an evaluation of rehabilitation efforts LG Underhill, PA BARTLETT, L BAUMANN, RJM CRAWFORD, BM DYER, ... Ibis 141 (1), 29-37, 1999 | 114 | 1999 |
| Initial impact of the Treasure oil spill on seabirds off western South Africa RJM Crawford, SA Davis, RT Harding, LF Jackson, TM Leshoro, ... South African Journal of Marine Science 22 (1), 157-176, 2000 | 107 | 2000 |
| Regionally coherent trends in colonies of African penguins Spheniscus demersus in the Western Cape, South Africa, 1987–2005 LG Underhill, RJM Crawford, AC Wolfaardt, PA Whittington, BM Dyer, ... African Journal of Marine Science 28 (3-4), 697-704, 2006 | 85 | 2006 |
| Recent distributional changes of seabirds in South Africa: is climate having an impact? RJM Crawford, AJ Tree, PA Whittington, J Visagie, L Upfold, KJ Roxburg, ... African Journal of Marine Science 30 (1), 189-193, 2008 | 71 | 2008 |
| Review of the rescue, rehabilitation and restoration of oiled seabirds in South Africa, especially African penguins Spheniscus demersus and Cape gannets Morus capensis, 1983–2005 AC Wolfaardt, AJ Williams, LG Underhill, RJM Crawford, PA Whittington African Journal of Marine Science 31 (1), 31-54, 2009 | 67 | 2009 |
| Recent trends in numbers of four species of penguins at the Prince Edward Islands RJM Crawford, PA Whittington, L Upfold, PG Ryan, SL Petersen, BM Dyer, ... African Journal of Marine Science 31 (3), 419-426, 2009 | 60 | 2009 |
| Winners and losers–responses to recent environmental change by South African seabirds that compete with purse-seine fisheries for food RJM Crawford, AB Makhado, LJ Waller, PA Whittington Ostrich 85 (2), 111-117, 2014 | 58 | 2014 |
| Abundance and distribution of avian and marine mammal predators of sardine observed during the 2005 KwaZulu-Natal sardine run survey SH O’Donoghue, PA Whittington, BM Dyer, VM Peddemors African Journal of Marine Science 32 (2), 361-374, 2010 | 58 | 2010 |
| Survival and movements of African penguins, especially after oiling P Whittington | 57 | 2002 |
| A changing distribution of seabirds in South Africa—the possible impact of climate and its consequences RJM Crawford, AB Makhado, PA Whittington, RM Randall, ... Frontiers in Ecology and Evolution 3, 10, 2015 | 56 | 2015 |
| Populations of surface-nesting seabirds at Marion Island RJM Crawford, J Cooper, BM Dyer, MD Greyling, NTW Klages, PG Ryan, ... | 56 | 1994 |
| Age at first breeding of the African Penguin P Whittington, N Klages, R Crawford, A Wolfaardt, J Kemper Ostrich-Journal of African Ornithology 76 (1-2), 14-20, 2005 | 47 | 2005 |
| Conservation assessment and management plan for southern African coastal seabirds M Du Toit, GC Boere, J Cooper, MS De Villiers, J Kemper, B Lenten, ... Cape Town: Avian Demography Unit and Apple Valley: Conservation Breeding …, 2003 | 47 | 2003 |
| Population trends of seabirds breeding in South Africa's Eastern Cape and the possible influence of anthropogenic and environmental change RJM Crawford, PA Whittington, PA Martin, AJ TREE, AB MAKHADO Marine Ornithology 37, 159-174, 2009 | 44 | 2009 |
| Patterns of immigration to and emigration from breeding colonies by African penguins PA Whittington, RM Randall, RJM Crawford, AC Wolfaardt, NTW Klages, ... African Journal of Marine Science 27 (1), 205-213, 2005 | 44 | 2005 |
| Return to Robben Island of African Penguins that were rehabilitated, relocated or reared in captivity following the Treasure oil spill of 2000 PJ Barham, RJM Crawford, LG Underhill, AC Wolfaardt, BJ Barham, ... Ostrich-Journal of African Ornithology 77 (3-4), 202-209, 2006 | 41 | 2006 |
| Establishment, growth and conservation of a mainland colony of Jackass Penguins Spheniscus demersus at Stony Point, Betty's Bay, South Africa PA Whittington, JH Hofmeyr, J Cooper Ostrich 67 (3-4), 144-150, 1996 | 39 | 1996 |
