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.