References
- Brown , L. 1970 . The African birds of prey Boston : Houghton Mifflin . Co
- Brown , L. 1972 . The breeding behaviour of the African Harrier Hawk Polyboroides typus in Kenya . Ostrich , 43 : 169 – 175 .
- Brown , L. 1976 . Birds of prey—their biology and ecology New York A & W publishers Inc
- Brown , L. and Amadon , D. 1968 . Eagles, hawks and falcons of the world Feltham : Hamlyn/Country Life .
- Burton , P. J. K. 1968 . The intertarsal joint of the Harrier Hawks (Polyboroides spp.) and the Crane Hawks ( . Geranospiza caerulescens). Ibis , 120 : 171 – 177 .
- North , M. E. W. 1939 . Field notes on certain raptorials and waterbirds in Kenya Colony Part Ii . Ibis , 3 (14th Ser.):617–643
- Rautenbach , I. L. 1978 . The mammals of the Transvaal Unpublished Ph.D. Thesis, Zoology, University of Natal, Pietermaritzburg
- Tarboton , W. “ Avian populations in Transvaal savanna. Proceedings IV Pan African Ornithological Conference. ” . In Ostrich Suppl. In press
- Thiollay , J. M. 1974 . “ Le peuplement avien de la savane de Lamto. ” . In Bull. Liaison Chercheurs Lamto Analyse d'un écosystème tropical humide: la savane de Lamto (Côte-d Ivoire., Numéro Special, fasc. IV:29–68
- Thiollay , J. M. 1975 . Les rapaces d'une zone de contact savane forêt en Côte-d'Ivoire . Alauda , 43 : 75 – 102 .
- Thiollay , J. M. 1976 . Besoins alimentaires quantitatifs de quelques oiseaux tropicaux . Terre et vie. , 30 : 229 – 245 .
- Tinbergen , N. 1953 . The study of instinct New York : Oxford University Press .