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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; [139] it became extinct in the late 20th century. [140] The Laysan duck is an insular relative of the mallard, with a very small and fluctuating population.
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.
Averaging 35.5 cm (14.0 in) and 370 g (13 oz), it rivals the green-winged teal as the smallest American duck. The bufflehead has a wingspan of 21.6 in (55 cm). [7] Adult males are striking black and white, with iridescent green and purple heads and a large white patch behind the eye.
Mallard ducks take flight over the San Luis National Wildlife Refuge in Los Banos, Calif., on Sunday, Oct. 20, 2024. ... This includes birds such as the Black-Necked Stilt, which according to ...
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]
In flight, the lack of a white border to the speculum is a key difference. The American black duck is darker than most mottled ducks, and its wing-patch is more purple than blue. The behaviour and voice are the same as the mallard. Mottled ducks feed by dabbling in shallow water, and grazing on land.
American Pekin flock. The Pekin or White Pekin is an American breed of domestic duck, raised primarily for meat. [6] [7] It derives from birds brought to the United States from China in the nineteenth century, [8] and is now bred in many parts of the world. [6]
The male Hawaiian duck has an average length of 48–50 cm (19–19.5 in) and the female has an average length of 40–43 cm (15.5–17 in). [10] On average, the male weighs 604 grams (21.3 ounces) and the female weighs 460 grams (16 ounces). [11] The Hawaiian duck is typically smaller than the mallard by 20 to 30 percent. [12] [13]
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