Crawford, R., Underhill, L., Coetzee, J., Fairweather, T., Shannon, L. and Wolfaardt, A. (2008) “Influences of the abundance and distribution of prey on African penguins <i>Spheniscus demersus</i> off western South Africa”, African Journal of Marine Science, 30(1), pp. 167–175. doi: 10.2989/ajms.2008.30.1.17.467.