REFERENCES
- Allan , D. G. 1989 . Strychnine poisoning and the conservation of avian scavengers in the Karoo, South Africa. . S. Afr. J. Wildl. Res. , 19 : 102 – 106 .
- Anderson , M. D. Birds of prey and farm reservoirs (Roofvoëls en plaasopgaardamme). Pamphlet Kimberley & Johannesburg : Northern Cape Nature Conservation Service & Endangered Wildlife Trust. . Undated
- Anderson , M. D. and Taljaard , F. D. 1994a . Help keer dat roofvoëls versuip. . Landbouweekblad , 861 : 34 – 36 .
- Anderson , M. D. and Taljaard , F. D. 1994b . Farm reservoirs can be deadly for raptors. Farmer's Weekly 2 December 38 – 40 .
- Anderson , M. D. 1995a . A distribution, status and feeding habit survey of the large eagles and vultures of the Northern Cape Province. Unpubl. report, Northern Cape Nature Conservation Service, Kimberley.
- Anderson , M. D. 1995b . Mortality of African Whitebacked Vultures in the North-West Province, South Africa. . Vulture News , 33 : 10 – 13 .
- Baker , A. J. and Whitacre , D. F. 1996 . Observations of King Vultures (Sarcoramphus papa). drinking and bathing. . J. Rapt. Res. , 30 : 246 – 247 .
- Bartholomew , G. A. and Cade , T. J. 1963 . The water economy of birds. . Auk , 80 : 504 – 539 .
- Boeker , E. I. and Ray , T. D. 1972 . Golden Eagle population studies in the south west. . Condor , 73 : 463 – 467 .
- Boshoff , A. F. and Vernon , C. J. 1979 . “ Supplementary notes on the Cape Vulture ” . In Gyps coprotheres in the Cape Province Cape Town : Special publication of the Cape Department of Nature and Environmental Conservation .
- Boshoff , A. F. and Vernon , C. J. 1980 . The past and present distribution and status of the Cape Vulture in the Cape Province. . Ostrich , 51 : 230 – 50 .
- Brooke , R. K. 1984 . South African Red Data Book—Birds. South African National Scientific Programmes Report 97 Pretoria : Foundation for Research Development .
- Brown , C. J. 1985 . The status and conservation of the Cape vulture in SWA/Namibia. . Vulture News , 14 : 4 – 15 .
- Brown , C. J. 1991a . Declining Martial Polemaetus bellicosus and Tawny Eagle Aquila rapax populations and causes of mortality on farmlands in central Namibia. . Biol. Cons. , 56 : 49 – 62 .
- Brown , C. J. 1991b . Raptor ringing in Namibia. . Gabar , 6 : 7 – 9 .
- Brown , C. J. 1997 . Population dynamics of the Bearded Vulture Gypaetus barbatus in South Africa. . Afr. J. Ecol. , 35 : 53 – 63 .
- Brown , L. H. and Cade , T. J. 1972 . Age classes and population dynamics of the Bateleur and African Fish Eagle. . Ostrich , 43 : 1 – 16 .
- Brown , L. H. and Watson , A. 1964 . The Golden Eagle in relation to its food supply. . Ibis , 106 : 78 – 100 .
- Butchart , D. 1988 . Vultures and water. . Vulture News , 19 : 21 – 23 .
- Chenaux-Repond , R. 1976 . Birds of prey cooling themselves by standing in water. . Honeyguide , 86 : 34
- Chilgren , J. D. 1979 . Drowning of grassland birds in stock tanks. . Wilson Bull. , 91 : 345 – 346 .
- Craig , T. H. and Powers , L. R. 1976 . Raptor mortality due to drowning in a livestock watering tank. . Condor , 78 : 412
- Glue , D. E. 1971 . Ringing recovery circumstances of small birds of prey. . Bird Study , 18 : 137 – 146 .
- Herholdt , J. J. 1995 . The breeding status (1988–1994) and management of raptors in the Kalahari Gemsbok National Park. Unpubl. M.tech. thesis, Technikon Pretoria, Pretoria, South Africa.
- Houston , D. C. 1986 . Guest editorial. . Out in the cold. Vulture News , 16 : 2 – 4 .
- Johnson , P. N. 1991 . Reducing the drowning of owls and raptors in Great Britain. . Vulture News , 25 : 23 – 24 .
- Knight , M. H. 1987 . Factors affecting vulture numbers in the Kalahari Gemsbok National Park. . Vulture News , 17 : 4 – 10 .
- Ledger , J. A. 1979 . Drowning of Cape Vultures in circular water tanks in South Africa. Paper presented at International Symposium on the Vultures, Santa Barbara, California.
- Ledger , J. A. 1982 . The Vulture Study Group. . Quagga , 1 : 5 – 9 .
- Maclean , G. L. 1993 . Roberts' birds of southern Africa Cape Town : John Voelcker Bird Book Fund. .
- Male , A. E. 1950 . Tawny Owls found drowned. . British Birds , 53 : 157
- Mundy , P. , Butchart , D. , Ledger , J. A. and Piper , S. 1992 . The vultures of Africa Johannesburg : Acorn Books & Russel Friedman Books .
- Newton , I. 1979 . Population ecology of raptors Berkhamsted : T & A.D Poyser. .
- Piper , S. E. 1994 . Mathematical demography of the Cape Vulture Vol. 1 & 2 , University of Cape Town . Unpubl. PhD Thesis
- Ristow , D. and Wink , M. 1992–94 . Distribution of non-breeding Eleonara's Falcon Falco elelonorae . II-Merill , 28 : 1 – 10 .
- Ryves , B. H. , Coulson , J. C. and Congreve , W. M. 1950 . Tawny Owls found drowned. . British Birds , 53 : 338 – 339 .
- Scott , H. A. 1997 . The status and breeding performance of Cape Vultures Gyps coprotheres at the Potberg and Little Karoo colonies, Western Cape: 1991–1995. . Vulture News , 36 : 2 – 16 .
- Sawyer , C. 1987 . The barn owl in the British Isles, its past, present and future. The Hawk Trust.
- Steyn , P. 1985 . Birds of prey of southern Africa Cape Town : David Philip. .
- Tyson , P. D. 1987 . Climatic change and variability in southern Africa Oxford University Press . Cape Town
- Vernon , C. J. 1977 . Some unusual Rhodesian raptors. . Honeyguide , 97 : 35 – 36 .
- Village , A. 1985 . Turnover, age and sex ratios of Kestrels in south Scotland. . J. Zool. Lond. , 206 : 175 – 189 .
- Watson , R. T. 1990 . Population dymamics of the Bateleur in the Kruger National Park. . Ostrich , 61 : 5 – 12 .