References
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- Brown , L. H. , Urban , E. K. and Newman , K. 1982 . The birds of Africa Vol. 1 , London : Academic Press .
- Kingdon , J. 1974 . East African Mammals HB London : Academic Press .
- Steyn , P. 1982 . Birds of prey of southern Africa Cape Town : David Philip. .
- Van Someren , V. G. L. 1956 . Days with birds . Fieldiana, Zoology , 38 : 88 – 105 .