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
2020-03-18 16:00Ruhondo wetland
2020-03-09 15:06Nyarutarama Lake and Golf Course5
2020-03-10 11:25Mabamba Swamp--Main channel8
2020-03-14 09:13Lochinvar NP2
2020-03-08 11:15West Coast NP--Abrahamskraal hide13
2020-03-20 18:19Rondevlei Nature Reserve
2020-03-12 07:30Murungaru, North Kinangop9
2020-03-07 09:30Strandfontein WTP40
2020-03-14 15:10Spier Wine Farm5
2020-03-18 06:30Aberdare NP--The Ark3
2020-03-15 07:27Dick Dent Bird Sanctuary25
2020-03-18 08:17Sothemba Lodge3
2020-03-08 14:00Bale Mts--Dinsho wetland20
2020-03-23 10:02Klein River lagoon
2020-03-15 08:09Walker Bay Nature Reserve
2020-03-09 08:03BMNP--Sanetti Plateau (please use more specific location)2
2020-03-19 10:54Kgomo-Kgomo1
2020-03-25 11:21Wolfhuiskraal Farm (restricted access)1
2020-03-14 15:11Zaagkuildrift Rd (Please be more specific)2
2020-03-25 17:23Eagle Canyon Golf Estate2
2020-03-07 06:22Jukskei River2
2020-03-15 06:48President Ridge Bird Sanctuary7
2020-03-10 19:05Rust de Winter Roadside Routes2
2020-03-25 17:06Delta Park2
2020-03-26 13:20Naturena1
2020-03-19 05:50Rietvlei Nature Reserve3
2020-03-26 15:45Thokoza Wetland5
2020-03-14 07:39Woodbush Forest2
2020-03-14 08:01Marievale Bird Sanctuary
2020-03-17 13:40Wonderfontein Pans4
2020-03-24 05:51Addo Elephant NP
2020-03-25 15:36Sterkfontein Dam Nature Reserve2
2020-03-12 14:30Daggakraal1
2020-03-16 06:10Wakkerstroom Lark Loop--Final 14 Km50
2020-03-12 11:22Wakkerstroom Lark Loop--First 6 Km1
2020-03-17 06:09Wakkerstroom area (Please be more specific)3
2020-03-15 15:57Wakkerstroom Wetland Reserve33
2020-03-22 06:30Wakkerstroom bridge/causeway20
2020-03-16 16:01Groenvlei18
2020-03-24 13:59Bushmans Nek25
2020-03-24 06:19Sani Valley Lodge5
2020-03-19 06:45Sani Road -- Pholela River3
2020-03-24 16:04Pevensey Road8
2020-03-22 13:52Midmar Dam - North Shore (Main Gate)6
2020-03-10 05:29Mkhuze - Ghost Mountain Inn--Boardwalk2
2020-03-06 15:49Zona Braza Beach Lodge8
2020-03-19 12:22Mpempe Pan18
2020-03-20 17:26St Lucia - estuary11