Yellow-billed Duck

Geelsnaveleend

Yellow-billed Duck (Anas undulata)

De Yellow-billed Duck (Anas undulata) is een dabbling duck uit de familie van de water birds that includes ducks, geese, and swans (Anatidae).

Naamgeving

Nederlandse naam:
Geelsnaveleend
Engelse naam:
Yellow-billed Duck
Duitse naam:
Gelbschnabelente
Franse naam:
Canard à bec jaune
Wetenschappelijke naam:
Anas undulata

Taxonomische indeling

Orde:
Anseriformes
Familie:
Anatidae
Onderfamilie:
Anatinae
Geslacht:
Anas

Beschrijving

Uiterlijke kenmerken:

African yellow billed Duck (Anas undulata undulate) 

Male:
Head and neck blackish grey with pale streaking, upperparts and underparts dark brown with pale feather edges. Wing has secondaries iridescent green, bordered in black and with white feather tips. White tips also to dark grey greater coverts (speculum green bordered with black and white). 

Female:
Are almost identical in appearance to males except for a somewhat duller feather and. has paler yellow splotchy bill coloration and a slightly smaller size.

Juvenile:
Looks like adults but more duller over all, darker on head and appears more spotted then mottled on underparts.

Abyssinian yellow billed duck (Anas undulata ruppelli) 

Male:
Darker (narrower pale feather edging), secondaries iridescent blue rather than green. The bill is bright yellow, black stripe down culmen (not reaching end of bill), black nail and cutting edges.

Female:
Are almost identical in appearance to males except for a somewhat duller feather and. has paler yellow splotchy bill more yellow-orange. and a slightly smaller size.

Juvenile:
Looks like adults but more duller over all, darker on head and appears more spotted then mottled on underparts.

Gedrag:

Yellow-billed Ducks mix freely with other species of water fowl, there is concern about the fact that there are several authenticated records of their hybridizing with Mallard Ducks which have been allowed to escape into the wild.

Maten en Gewicht

Lengte man:
De man (woerd) van de Yellow-billed Duck heeft een lichaamslengte van ongeveer 51-58 centimeters. De vrouw (pop) heeft een lichaamslengte van ongeveer 51-58 centimeters.
Gewicht man:
Het mannetje weegt ongeveer 312-510 gram. Het vrouwtje weegt ongeveer 312-510 gram.
Het gewicht is notoir variabel en kan alleen als indicatie worden gebruikt!
Ondersoorten:

There are two subspecies:

  • Anas undulata undulate - African yellow billed Duck
  • Anas undulata ruppelli - Abyssinian yellow billed duck

 

Notitie:

Dabbling Ducks are generally hardy, easy to maintain and easy to breed. Shelter may be required by some of the smaller species in winter. They should be provided with cover (including marginal pond cover) and loafing areas as well as water. A pen which is 50% water is suggested. The water may be shallow (i.e. no more than two feet deep is required), and muddy areas for dabbling in are also appreciated. These ducks are generally good in mixed collections, although the smaller and quieter species may be bullied. Territorial disputes between ducks of the same species may be avoided by keeping only one pair of each species in an enclosure, unless the area is very large. For a single pair of ducks a pen are of 50 to 100 square metres, depending on the size of duck, should be provided.

Most species are ground nesters and both close ground cover and ground level nest boxes should be provided. Hand-rearing is generally preferred, as these ducks are generally poor parents in captive conditions, particularly in enclosures shared with other waterfowl. These ducks are prone to hybridization, particularly with closely related species, which should be kept apart from one another.

Yellow-billed ducks are hardy and not difficult to keep. Cover and loafing areas should be provided as well as water.

These ducks are easily bred and prolific; they may use natural cover or a nest box for nesting, and favour islands. Usually lay April to June.

Readily hybridise with closely-related species and should be maintained separately from such species. Hybrids also have been reported with Rosy-billed pochard (Netta peposaca)Red-crested pochard (Netta rufina) and Wood duck (Aix sponsa).

 

Breeding:
Het vrouwtje Yellow-billed Duck legt doorgaans zo'n 4-12 creamy to yellowish buff eieren het broeden duurt 27-29 dagen.

Kunstmatig broeden:

De ideale relatieve luchtvochtigheid voor het uitbroeden van de meeste watervogeleieren is 55% voor grondbroeders en 40% bij holenbroeders. De temperatuur is meestal 37,4° C. Stel ventilatie in zoals aanbevolen door de fabrikant van de broedmachine. Eieren moeten minimaal 4 keer per dag automatisch of met de hand worden gedraaid. Naarmate de vrucht zich ontwikkelt, verliest het ei water en wordt de luchtzak groter. Bij normale ontwikkeling van een ei met een incubatietijd van 27-29 dagen neemt de luchtzak ongeveer een derde van het ei in beslag, dit bij drie dagen voor uitkomst. Reinheid is van vitaal belang en idealiter moet de luchtvochtigheid worden verhoogd tot 65% nadat de eerste tekenen van uitkomst zichtbaar worden.


Ringdagen:
Aanbevolen passende ringmaat voor de Yellow-billed Duck is 12 mm.
De gesloten pootring kan alleen aangebracht worden bij een jonge dabbling duck van ongeveer 12-14 dagen oud.

It doesn't matter what leg that you band, but it's good to have a consistent system.
Suggested: Left leg = Female, Right leg = Male
Onderhoudsvoeder:
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Foto's van de Yellow-billed Duck