The yellow-billed duck (Anas undulata) is a 51–58 cm long 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.

Sexes are similar, and juveniles are slightly duller than adults. The north-eastern race is darker and has a brighter bill and blue speculum.

It is a bird of freshwater habitats in fairly open country and feeds by dabbling for plant food mainly in the evening or at night. It nests on the ground in dense vegetation near water. The clutch numbers between six and twelve eggs.

The male has a teal-like whistle, whereas the female has a mallard-like quack.

There are two subspecies of the yellow-billed duck: A. undulata rueppelli (northern yellow-billed duck) A. undulata undulata (southern yellow-billed duck)

The yellow-billed duck is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. The southern nominate subspecies is declining due to competition and hybridization with feral mallards (Rhymer 2006).

Yellow-billed Duck
Date Location Count
2020-01-27 07:00Lake Nkuruba NR2
2020-01-29 16:12Belmond Eagle Island Lodge1
2020-02-15 08:45Mabamba Swamp10
2020-02-04 06:35Mabamba Swamp--Main channel2
2020-02-04 11:35West Coast NP--Abrahamskraal hide8
2020-01-31 07:27Lake Nakuru NP8
2020-02-02Rietvlei Wetlands Reserve
2020-01-29 08:29Intaka Island18
2020-02-14 08:45Rondevlei Nature Reserve60
2020-02-05 14:02Strandfontein WTP15
2020-01-30 16:30Paardevlei17
2020-02-08 15:36Dick Dent Bird Sanctuary20
2020-01-20 18:35Manguo Swamp6
2020-01-27 07:40Paradise Lost3
2020-02-13 07:21Kfeet, Wetlands & Lily Lake, Karura Forest2
2020-02-15 07:37Karura Forest, Muthaiga1
2020-02-07 08:32Goba Wabe Shebelle Hotel3
2020-02-02 06:00Nyika National Park2
2020-02-06 02:22Bontebok NP2
2020-02-15 08:12Zaagkuildrift Rd (Please be more specific)3
2020-02-09 07:59Soutpan2
2020-02-16 09:00Diepsloot Nature Reserve5
2020-02-02 10:34Rooiwal WTP3
2020-02-16 06:49Eagle Canyon Golf Estate5
2020-01-29 16:52Norscot Koppies Kingfisher Nature Reserve2
2020-02-18 08:38Jukskei River1
2020-02-15 02:32President Ridge Bird Sanctuary2
2020-02-10 09:24Wilderness NP--Rondevlei Bird Hide1
2020-02-17 10:34Austin Roberts Bird Sanctuary15
2020-02-03 17:55Candlewoods Wetland2
2020-02-09 11:14Free State Botanical Gardens1
2020-02-15 05:43Rietvlei Nature Reserve1
2020-01-20 09:16Korsman Bird Sanctuary4
2020-02-16 09:12Rustfontein Nature Reserve6
2020-01-25 05:40Wilge River Valley (upper)1
2020-02-16 08:25Marievale Bird Sanctuary4
2020-02-15 07:36Marievale Bird Sanctuary--Hadeda Hide1
2020-02-16 07:50Nature's Valley2
2020-01-25 02:50Loskop Dam Nature Reserve6
2020-02-03Hannah Game Lodge1
2020-02-17 16:45Cape Recife WTP1
2020-02-17 07:07Cape Recife Lighthouse2
2020-02-18 17:20Wakkerstroom Wetlands--Clive Beck Hide12
2020-02-08 14:30Karkloof - Rietvlei4
2020-01-26 14:00Midmar Dam - South Shore (Thurlow Gate)4
2020-02-05 08:45Cedara Agricultural College Conservancy2
2020-02-13 08:44Macaneta--Tidal wetland, dune forests and coast2