Anas undulata

Anas undulata (*)

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Anseriformes
Familia: Anatidae
Subfamilia: Anatinae
Genus: Anas
Species: Anas undulata

Name

Anas undulata Dubois, 1839

References

* Ornithologische Gallerie 1 p.119

Vernacular names
Internationalization
Afrikaans: Geelbekeend
Česky: Kachna žlutozobá
Deutsch: Gelbschnabelente
English: Yellow-billed Duck
Español: Pato de pico amarillo
Français: Canard à bec jaune
日本語: キバシガモ
‪Norsk (bokmål)‬: Gulnebband
Svenska: Gulnäbbad and

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).

References

* BirdLife International (2004). Anas undulata. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern
* Rhymer, Judith M. (2006): Extinction by hybridization and introgression in anatine ducks. Acta Zoologica Sinica 52(Supplement): 583–585. PDF fulltext
* Ian Sinclair, Phil Hockey and Warwick Tarboton, SASOL Birds of Southern Africa (Struik 2002) ISBN 1-86872-721-1
* Madge and Burn, Wildfowl ISBN 0-7470-2201-1

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