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The Mariana mallard was a resident allopatric population – in most respects a good species – apparently initially derived from mallard-Pacific black duck hybrids; [138] it became extinct in the late 20th century. [139] The Laysan duck is an insular relative of the mallard, with a very small and fluctuating population.
The mottled duck (Anas fulvigula) [note 1] or mottled mallard is a medium-sized species of dabbling duck. It is intermediate in appearance between the female mallard and the American black duck. It is closely related to those species, and is sometimes erroneously considered a subspecies of the former.
Possible backcross between a Mallard and American black duck. All the species within the mallard complex are known to hybridize with other members within overlapping ranges. Mallards, both domestic and wild in particular are notorious hybridizers, know to frequently hybridize within the mallard complex and even outside of Anas.
The American black duck (Anas rubripes) is a large dabbling duck in the family Anatidae.It was described by William Brewster in 1902. It is the heaviest species in the genus Anas, weighing 720–1,640 g (1.59–3.62 lb) on average and measuring 54–59 cm (21–23 in) in length with an 88–95 cm (35–37 in) wingspan.
The African black duck (Anas sparsa) is a species of duck of the genus Anas.It is genetically closest to the mallard group, [2] but shows some peculiarities in its behavior [3] and (as far as they can be discerned) plumage; it is accordingly placed in the subgenus Melananas pending further research.
A male mallard. The speculum feathers are bright blue with white edges. The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or remiges, of some birds. Examples of the colour(s) of the speculum in a number of ducks are: Common teal and green-winged teal: Iridescent green edged with buff. [1]
This is supported by the observation that in mallard × American black duck hybrids, females of both taxa prefer the sexually dimorphic mallard drakes over the dull-plumaged black duck drakes; [23] [24] that the green-winged teal is in some aspects—such as the less contrasting nuptial plumage—intermediate between the common and speckled ...
Anatidae: Eurasian teal (Anas crecca), gadwall (Anas strepera), northern pintail (Anas acuta), mallard (Anas platyrhynchos), greater scaup (Aythya marila), long-tailed duck (Clangula hyemalis), northern shoveler (Anas clypeata), garganey (Anas querquedula), Eurasian wigeon (Anas penelope), ferruginous duck (Aythya nyroca), common goldeneye ...