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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.
Mallard ducks are not endemic to Niue, and the country's habitat is not suitable for them, as Niue lacks any surface fresh water, [5] [6] [3] which mallards require. [ 7 ] : 507 Trevor lived as a local celebrity in a particular roadside puddle which the Niue Fire Service would refill when it began to dry out; Trevett learned of Trevor when she ...
The female is light brown, with plumage much like a female mallard. It can be distinguished from that species by the dark orange-edged bill, smaller size, the white speculum, and white belly. [12] Both sexes go through two moults annually, following a juvenile moult. [10] The gadwall is a quieter duck, except during its courtship display.
This sociable duck is found in a variety of wetland habitats, and its nesting habits are much like those of the mallard, which is encroaching on its range in New Zealand. [10] It feeds by upending, like other Anas ducks. It has a dark body, and a paler head with a dark crown and facial stripes. In flight, it shows a green speculum and pale ...
The Laysan duck is a poor flyer, but walks and runs well, with a pelvic girdle adapted to terrestrial foraging. Its wings and wing muscles are reduced; it prefers to freeze in place when pursued. Energetic foraging behavior includes a fly-snapping sprint through Neoscatella sexnotata brine fly swarms. With necks outstretched, and bills close to ...
Domestic ducks are mostly promiscuous, where wild mallards are monogamous. Domestic ducks have lost the mallard's territorial behaviour, and are less aggressive than mallards. [7] [8] Despite these differences, domestic ducks frequently mate with wild mallard, producing fully fertile hybrid offspring. [9]
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An 8 week old Khaki Campbell (rear) and a 13-week-old Mallard. Mrs Adele Campbell [12] commenced poultry-keeping around 1887 and later purchased an Indian Runner Duck of indiscriminate type which was an exceptional layer (182 eggs in 196 days), [13] [14] and which formed the basis in developing the "Campbell Ducks"; in her own words "Various matings of Rouen, Indian Runner and Wild Duck were ...
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