Adams, N. 1990. Feeding biology and energetics of King Aptenodytes patagonicus and Gentoo Pygoscelis papua Penguins at sub-Antarctic Marion Island. PhD Thesis, University of Cape Town. Supervisors: Roy Siegfried, John Cooper and Robert Prys-Jones.
Du Plessis, M. 1990. Behavioural ecology of the Redbilled Woodhoopoe Phoeniculus purpureus in South Africa. PhD Thesis, University of Cape Town. Supervisor: Phil Hockey.
Jackson, S. 1990. Seabird digestive physiology in relation to foraging ecology. PhD Thesis, University of Cape Town. Supervisor: Roy Siegfried and David Duffy.
Fraser, M. 1990. Effects of natural vegetation, fire and alien plant invasion on bird species assemblages in mountain fynbos of the southwestern Cape Province, South Africa. MSc Thesis, University of Cape Town. Supervisor: Tim Crowe.