References
- Brown , L. H. and Britton , P. L. 1980 . The breeding seasons of East African birds Nairobi : East Africa Natural History Society .
- Dowsett , R. J. 1972 . Geographical variation in . Pseudhirundo griseopyga. Bull. Brit. Orn. Club , 92 : 97 – 100 .
- Elgood , J. H. , Fry , C. H. and Dowsett , R. J. 1973 . African migrants in Nigeria . Ibis , 115 : 375 – 409 .
- Ginn , H. B. and Melville , D. S. 1983 . Moult in birds Tring : British Trust for Ornithology .
- Hall , B. P. and Moreau , R. E. 1970 . An atlas of speciation in African passerine birds London : British Museum (Natural History) .
- Mackworth-Praed , C. W. and Grant , C. H. B. 1973 . Birds of west central and western Africa Vol. II , London : Longman .
- Maclean , G. L. 1985 . Roberts birds of southern Africa Cape Town : John Voelcker Bird Book Fund. .
- Newton , I. 1966 . The moult of the Bullfinch . Pyrrhula pyrrhula. Ibis , 108 : 41 – 67 .
- Wells , D. R. and Walsh , F. 1969 . Birds of northern and central Borgu . Bull. Niger. Orn. Soc. , 6 ( 23 ) : 63 – 93 .
References
- Brooke , R. K. 1984 . South African Red Data Book-Birds . S. Afr. Nat. Sci. Prog. Rpt. , 97 : 1 – 213 .
- Chapin , J. P. 1953 . “ The birds of the Belgian Congo. Part 3. ” . In Bull. Amer. Mus. Nat. Hist. 75A
- Clancey , P. A. 1964 . The birds of Natal and Zululand London : Oliver & Boyd .
- Ginn , H. B. and Melville , D. S. 1983 . Moult in birds Tring : British Trust for Ornithology .
- Mackworth-Praed , C. W. and Grant , C. H. B. 1973 . Birds of west central and western Africa London : Longmans . II
- Maclean , G. L. 1985 . Roberts' birds of southern Africa Ca Town : John Voelcker Bird Book Fund. .
- Newton , I. 1966 . The moult of the Bullfinch . Pyrrhula pyrrhula. Ibis. , 108 : 41 – 46 .
- Sclater , W. L. 1911 . Birds collected by Mr Claude H. B. Grant at various localities in South Africa. Part II . Ibis , 5 : 405 – 438 . ser 9
- Snell , M. L. 1963 . Study of the Blue Swallow . Bokmakierie , 15 : 4 – 7 .
- Snell , M. L. 1969 . Notes on the breeding of the Blue Swallow . Ostrich , 40 : 65 – 74 .
- Snell , M. L. 1970 . Nesting behaviour of a pair of Blue Swallows . Bokmakierie , 22 : 27 – 29 .
- Snell , M. L. 1979 . The vulnerable Blue Swallow . Bokmakierie , 31 : 74 – 78 .
References
- Faegri , K. and van der Pijl , L. 1978 . The principles of pollination ecology Oxford : Pergammon Press. .
- Dressler , R. L. 1971 . Dark pollina in hummingbird-pollinated orchids, or do hummingbirds suffer from strabismus . Amer. Natur. , 105 : 80 – 85 .
- Linder , H. P. 1981 . Taxonomic studies on the Disinae. III. A revision of Disa Berg. excluding Sect. Micranthae Lindl . Contr. Bolus Herb. , 9 : 1 – 370 .
- Marloth , R. 1915 . The flora of South Africa Vol. IV Monocotyledones Cape Town : Darter Bros. .
- Oatley , T. B. and Skead , D. M. 1972 . Nectar feeding by South African birds . Lammergeyer , 15 : 65 – 74 .
- Porsh , O. 1926 . Kritische Quellenstudien über Blumenbesuch durch Vögel I . Biol. Gener. , 2 : 218 – 240 .
- Skead , C. J. 1967 . The sunbirds of southern Africa, also the sugarbirds, the white-eyes and the spotted creeper Cape Town : Balkema. .
- Stewart , J. and Hennessy , E. F. 1981 . Orchids of Africa London : Macmillan .
- Stewart , J. , Linder , H. P. , Schelpe , E. A. and Hall , A. V. 1982 . Wild orchids of southern Africa Johannesburg : Macmillan .
- Vogel , S. 1954 . Blütenbiologische Typen als Elemente der Sippengliederung Jena : Gustav Fischer . dargestellt anhand der Flora Südafrikas
References
- Bond , P. 1987 . A revision of Oldenburgia (Asteraceae—Mutisieae) . S. Afr. J. Bot. , 58 : 493 – 500 .
- Cabrera , A. L. 1977 . “ Mutisieae—a systematic review. ” . In The biology and chemistry of the Compositae II Edited by: Heywood , V. H. , Harborne , J. B. and Turner , B. L. eds). London, Academic
- Coetzee , J. H. and Giliomee , J. H. 1985 . Insects in association with the inflorescence of Protea repens (L.) (Proteaceae) and their role in pollination . J. Ent. Soc. S. Afr. , 48 : 303 – 314 .
- Faegri , K. and Van Der Pijl , L. 1978 . The principles of pollination ecology Oxford : Pergammon .
- Skead , C. J. 1967 . The sunbirds of southern Africa, also the sugarbirds, the white-eyes and the spotted creeper Ca Town : Balkema. .
- Vogel , S. 1954 . Blütenbiologische Typen als Elemente der Sippengliederung, dargestellt anhand der Flora SüdafriKs Jena : Gustav Fischer .
References
- Aylmer , G. 1944 . The use of animate perches by the Carmine Bee-eater . Ibis , 86 : 554
- Cave , F. O. 1946 . Some further notes on Merops-Ardeotis perching associations . Ibis , 88 : 236 – 238 .
- Cunningham-Van Someren , G. R. 1970 . Animated perches and feeding associations of birds in the Sudan . Bull. Brit. Orn. Club , 90 : 120 – 122 .
- Dean , W. R.J. and MacDonald , A. W. 1981 . A review of African birds feeding in association with mammals . Ostrich , 52 : 135 – 155 .
- Fraser , W. 1982 . Feeding associations of Carmine Bee-eaters with other animals . Bokmakierie , 34 : 18
- Fry , C. H. 1984 . The Bee-eaters Calton : T. & A. D. Poyser. .
- Jackson , T. H. E. 1945 . Some Merops-Ardeotis perching associations in northern Kenya . Ibis , 87 : 284 – 286 .
- Mackworth-Praed , C. W. 1946 . Animate perching associations . Ibis , 88 : 132
- Milton , M. 1970 . Matebeleland notes . Honeyguide , 61 : 7 – 8 .
- Van Someren , V. G. L. 1945 . The use of animate perches . Ibis , 87 : 109