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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.
Male and female yellow-billed ducks have a statistically significant difference in life spans. Male ducks live for 4 years and 4 months on average while female ducks only live for just over 3 years. As such the difference in survival rate is statistically significant as well. 79% of males survive any given year while only 72% of females do.
A crest of feathers may appear in any duck breed or type deriving from the wild Mallard, Anas platyrhynchos, with a frequency of some 0.0001%–0.001% of all eggs hatched. [9]: 89 It results from the action of a very variable autosomal dominant allele, which is semi-lethal and may display incomplete penetrance as well as incomplete dominance.
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]
Pecten along the bill Mallard duckling preening. Ducks eat food sources such as grasses, aquatic plants, fish, insects, small amphibians, worms, and small molluscs. Dabbling ducks feed on the surface of water or on land, or as deep as they can reach by up-ending without completely submerging. [24]
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 ...
A few are kept for show, or for their ornamental value. Most varieties of domesticated ducks, apart from the Muscovy duck and hybrids, are descended from the mallard, which was domesticated in China around 2000 BC. Duck farming is simplified by their reliable flocking behaviour, and their ability to forage effectively for themselves. Over 80% ...
The level of monogamy varies within the family; many of the smaller ducks only maintain the bond for a single season and find a new partner the following year, whereas the larger swans, geese and some of the more territorial ducks maintain pair bonds over a number of years, and even for life in some species.