- Anas undulata
Grey, darker head, bright yellow bill, wings are white below with white-bordered green speculum. Sexes are similar, and juveniles are slightly duller than adults. The north-eastern race is darker and has a brighter bill and blue speculum.
Southern and eastern Africa.
Anas undulata has two subspecies:
- A. u. undulata
- A. u. rueppelli
Freshwater in fairly open country.
The diet includes plant food for which it dabbles mainly in the evening or at night.
It nests on the ground in dense vegetation near water; 6-12 eggs are laid.
- Clements, JF. 2008. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2008. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist.
- BirdForum Opus contributors. (2021) Yellow-billed Duck. In: BirdForum, the forum for wild birds and birding. Retrieved 11 April 2021 from https://www.birdforum.net/wiki/Yellow-billed_Duck