mallard duck
platbeka anaso
mallard oor Esperanto
mallard
en
A common and widespread dabbling duck, Anas platyrhynchos, whose male has a distinctive dark green head.
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platbeka anaso
en
a common and widespread dabbling duck, Anas platyrhynchos
anaso
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Mallard
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Platbeka anaso
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A species of flightless duck is known from a prehistoric bone found on Rota in 1994; it was apparently not closely related to the Mariana mallard.
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The speculum feathers are green as in some of its relatives, but unlike in these, it is bordered white as in the mallard.
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However, all the Hawaiian ducks in the reestablished populations have bred with feral mallard ducks and have produced hybrid offspring that are fully fertile (Griffin et al. 1989); consequently, "pure" Hawaiian ducks are still only found on Kauaʻi.
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It was assumed that far more mallard drakes mate with grey duck females than vice versa based on the fact that most hybrids show a mallard-type plumage, but this is not correct; it appears that the mallard phenotype is dominant, and that the degree to which species contributed to a hybrid's ancestry cannot be determined from the plumage.
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Conversely, though crossing Mallard drakes with Muscovy hens is possible, the offspring are desirable neither for meat nor for egg production.
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Availability of mallards, mallard ducklings, and fertilised mallard eggs for public sale and private ownership, either as poultry or as pets, is currently legal in the United States except for the state of Florida, which has currently banned domestic ownership of mallards.
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Mallards sometimes arrive on its island home during migration, and can be expected to occasionally have remained and hybridised with Laysan ducks as long as these species have existed.
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The Eurasian teal belongs to the "true" teals, a group of small Anas dabbling ducks closely related to the mallard (A. platyrhynchos) and its relatives; that latter group in fact seems to have evolved from a true teal.
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The hybrids of mallards and the yellow-billed duck are fertile, capable of producing hybrid offspring.
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The conservation of this species was long hampered by its—entirely erroneous, see below—dismissal as a variant of the mallard which deserved no special interest.
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The 40–60% of eggs that are fertile result in birds raised only for their meat or for production of foie gras: they grow fast like mallard-derived breeds but to a large size like Muscovy ducks.
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This species, like the mallard, does not form stable pairs.
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The speculum was usually as in the "platyrhynchos" type, i.e. mallard-like, but at least two specimens have the green speculum of the Pacific black duck.
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The pattern is dense short streaks on the head and neck, and scaly spots on the rest of the body; overall they look much like a tiny mallard (A. platyrhynchos) hen when at rest.
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Its taxonomic status is debated, and it has variously been treated as a full species, a subspecies of the mallard or of the Pacific black duck, or sometimes as a subspecies of the Indian spot-billed duck.
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The mallards of North America, for example, are apparently mostly derived from some males which arrived from Siberia, settled down, and mated with American black duck ancestors.
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Their statement, "Northern black ducks are now no more distinct from mallards than their southern conspecifics" only holds true in regard to the molecular markers tested.
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Haplotypes typical of American mallard relatives and spotbills can be found in mallards around the Bering Sea.
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There, and elsewhere, mallards are spreading with increasing urbanisation and hybridising with local relatives.
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They formerly occurred on the Hawaiian Islands and were derived from dabbling ducks, possibly even a close ancestor of the mallard: Chelychelynechen Thambetochen Ptaiochen Subfossil remains of a small, flightless dabbling duck have been recovered on Rota in the Mariana Islands.
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Due to the outward similarity of Meller's duck to the female mallard, it was commonly placed close to that species.
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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; unfortunately, it became extinct in the late 20th century.
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Females looked essentially like a dark mallard female with the orange of the feet and near the bill tip usually a bit more pure.
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The Mariana mallard inhabited wetlands, mostly inland but occasionally also in coastal areas.
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The now extinct Mariana mallard was probably originally derived from hybrids between this species and the mallard, which came to the islands during migration and settled down there.
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