Rjm Crawford

Seabird consumption and production in the Benguela and Western Agulhas ecosystems

A. J. Williams, Peter G. Ryan, P. Ryan, 1991 .

Implications for seabirds off South Africa of a long-term change in the distribution of sardine

Les G. Underhill, R. Crawford, T. Fairweather, 2008 .

Collapse of South Africa's penguins in the early 21st century

Les G. Underhill, Res Altwegg, Lorien Pichegru, 2011 .