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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 retention of ancestral genetic variation can be caused by incomplete lineage sorting (ILS) and introgression after secondary contact. These two factors can cause genetic variation to be shared between closely related species which is possibly why an American black duck or a Mottled duck (Anas fulvigula) may have notable white on its speculum or a Mexican duck may have flecks of green.
American wigeon: Mareca americana (Gmelin, JF, 1789) 92 Amsterdam wigeon: Mareca marecula (Olson & Jouventin, 1996) (E) 93 African black duck: Anas sparsa Eyton, 1838: 94 Yellow-billed duck: Anas undulata Dubois, CF, 1838: 95 Meller's duck: Anas melleri Sclater, PL, 1865: 96 Pacific black duck: Anas superciliosa Gmelin, JF, 1789: 97 Laysan duck ...
Native to South American and sub-Saharan Africa, it's unlikely that many people will be able to come across these winged cuties in the wild. ... It's all about the eyes with the Pacific black duck ...
Black duck may refer to three dabbling ducks: African black duck, Anas sparsa; American black duck, Anas rubripes; Pacific black duck, Anas superciliosa;
The management board reports to the North American Waterfowl Management Plan, and is responsible for "overall program coordination, and for developing funding and delivery mechanisms". [5] The Black Duck Joint Venture receives some of its funding from research grants. From 1989 to 1994, it had an operational budget of about CAD $870,000. [8]
The black scoter or American scoter (Melanitta americana) is a large sea duck, 43 to 49 cm (17 to 19 in) in length. The genus name is derived from Ancient Greek melas "black" and netta "duck". The species name is from the Latin for "American".
American black duck: Iridescent violet bordered in black and may have a thin white trailing edge. [1] Northern pintail: Iridescent green in male and brown in female, both are white on trailing edge. [2] Gadwall: Both sexes have white inner secondaries. [1] Yellow-billed duck: Iridescent green or blue, bordered white. [4]