Amethyst Sunbird
Afrikaans name: Swartsuikerbekkie

Photo © Steven Herbert
Nectarinia amethystina / Chalcomitra amethystina
I think that the old name of Black Sunbird is better suited to this species as males are predominantly black with only a small patch of amethyst colour on their throat.
The male Amethyst Sunbird is as I have described above. The female is far more drab with a brown back and blotches and streaks of black on her underparts.
They are found in many countries in Africa. In South Africa they occur in a band from the Western Cape through KwaZulu-Natal to North West Province.
The Amethyst Sunbird mainly feeds off nectar but does also eat spiders and it catches flying insects.
The female makes the nest which is an enclosed structure hanging from a twig. Up to 3 eggs are laid.
References and further reading
Wildlife of Southern Africa - Author: Martin Withers and David Hosking - Published: 2011 - Page: 164The Birds of South Africa - 1st Edition - Author: Dr. Austin Roberts - Published: 1949 - Page: 327
The Birds of South Africa - Author: Hazel Stokes - Published: 1979 - Page: 44
Sasol Birds of Southern Africa - 4th Edition - Author: Ian Sinclair et al. - Published: 2011 - Page: 408
Southern African Bird Names Explained - Author: Charles Clinning - Published: 1989 - Page: 92
Roberts Birds of Southern Africa - 6th Edition - Author: Gordon Lindsay Maclean - Published: 1993 - Page: 699
Sasol Birds of Southern Africa - 1st Edition - Author: Ian Sinclair et al. - Published: 1993 - Page: 374
Roberts Birds of Southern Africa - 5th Edition - Author: Gordon Lindsay Maclean - Published: 1985 - Page: 700
Roberts Birds of South Africa - 4th Edition - Author: McLachlan and Liversidge - Published: 1981 - Page: 549
Roberts Birds of South Africa - 3rd Edition - Author: McLachlan and Liversidge - Published: 1975 - Page: 537
Questions and Answers - Birds of Southern Africa - Author: Deirdre Richards - Published: 1990 - Page: 9
Meeting with Birds - Author: Tom Spence - Published: 1986 - Page: 105
Newmans Birds of Southern Africa - 1st Edition - Author: Ken Newman - Published: 1984 - Page: 396
Newmans Birds of Southern Africa - 7th Edition - Author: Ken Newman - Published: 2000 - Page: 396
Newmans Garden Birds - Author: Ken Newman - Published: 1991 - Page: 102
Ian Sinclairs Field Guide to the Birds of Southern Africa - 2nd Edition - Author: Ian Sinclair - Published: 1988 - Page: 294
Geoff Lockwoods Garden Birds of Southern Africa - Author: Geoff Lockwood - Published: 0 - Page: 122
Garden Birds in South Africa - Author: Duncan Butchart - Published: 2017 - Page: 129
Field Guide to the Birds of Kruger National Park - Author: Ian Sinclair and Ian Whyte - Published: 1991 - Page: 198
Collins Illustrated Checklist - Birds of Southern Africa - 1st edition - Author: Ber van Perlo - Published: 1999 - Page: 70
Birds of the Transkei - Author: C.D. Quickelberge - Published: 1989 - Page: 113
Birds of the Transvaal - Author: Tarboton, Kemp and Kemp - Published: 1987 - Page: 248
Birds of the South Western Cape - Author: Joy Frandsen - Published: 0 - Page: 211
Birds of Southern Africa - Kruger National Park - Author: Kenneth Newman - Published: 1985 - Page: 204
Birds of the Natal Drakensberg Park - Author: Robin Little and William Bainbridge - Published: 1992 - Page: 107
A First Guide to South African Birds - 6th Edition - Author: Leonard Gill - Published: 1959 - Page: 37
A First Guide to South African Birds - 7th Edition - Author: Leonard Gill - Published: 1975 - Page: 37
Bird Atlas of Natal - Author: Digby Cyrus and Nigel Robson - Published: 1980 - Page: 265
A Field Guide to the Birds of Southern Africa - 2nd Edition - Author: O.P.M. Prozesky - Published: 1983 - Page: 290