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2. Movements of the blue crane Anthropoides paradisea (Aves: Gruidae) in South Africa as assessed by bird-atlas data and road counts;Allan;Durban Museum Novitates,1997
3. Unpredictable habitats and evolution of bird migration;Alerstam;Oikos,1979
4. The distribution of Acridoidea (grass-hoppers) in relation to overgrazing;Baker;Botswana Notes and Records,1985
5. Patterns of elephant damage to vegetation in northern Botswana;Ben-Shahar;Biological Conservation,1993