1. Observational study of behaviour: sampling methods;Altmann;Behaviour,1974
2. Interrelationships between hyaenas and their competitors in the Transvaal lowveld;Bearder;Nuwe Reeks Publ., Univ. Pretoria,1975
3. Feeding habits of spotted hyaenas in a woodland habitat;Bearder;E. Afr. Wildl. J.,1978
4. Kin selection in lions and in evolution;Bertram,1976
5. Serengeti predators and their social systems;Bertram,1979