The Yellow-billed Duck (Anas undulata) is a dabbling duck which is an abundant resident breeder in southern and eastern Africa.
This duck is not migratory, but will wander in the dry season to find suitable waters. It is highly gregarious outside the breeding season and forms large flocks.
These are mallard-sized mainly grey ducks with a darker head and bright yellow bill. The wings are whitish below, and from above show a white-bordered green speculum.