Afrikaans name: Geelbekeend
What you have here is a common and unmistakable species. They are very common in South Africa but less common north of the border.
Male and female have the same colouration. Both have the bright yellow bill.
They grow to a length of over 50 cm.
The Yellow-billed Duck mainly eats water weeds but they do take some insects as well. It may feed both in the day and at night.
They make a nest on the ground amongst dense vegetation. They can lay as many as 10 to 12 eggs.
References and further readingA First Guide to South African Birds - 7th Edition - Author: Leonard Gill - Year Published: 1975 - Page: 168
Birds of the Natal Drakensberg Park - Author: Robin Little and William Bainbridge - Year Published: 1992 - Page: 10
Birds of the South Western Cape - Author: Joy Frandsen - Year Published: - Page: 39
Collins Illustrated Checklist - Birds of Southern Africa - 1st edition - Author: Ber van Perlo - Year Published: 1999 - Page: 12
Field Guide to the Birds of Kruger National Park - Author: Ian Sinclair and Ian Whyte - Year Published: 1991 - Page: 42
Field Guide to the Cradle of Humankind - Author: B. Hilton-Barber & Prof. L. R. Berger - Year Published: 2004 - Page: 178
Roberts' Birds of Southern Africa - 5th Edition - Author: Gordon Lindsay Maclean - Year Published: 1985 - Page: 84
Roberts' Birds of Southern Africa - 6th Edition - Author: Gordon Lindsay Maclean - Year Published: 1993 - Page: 85
Sasol Birds of Southern Africa - 4th Edition - Author: Ian Sinclair et al. - Year Published: 2011 - Page: 78