Major threats include drainage of deep permanent wetlands, or their degradation as a result of introduced fish, peripheral cattle grazing, salinization, and lowering of ground water.[4]. [2][3][7][12][13], Lesser scaup forage mainly by sifting through the bottom mud, usually after diving and swimming underwater, occasionally by dabbling without diving. 0 bids. See more ideas about waterfowl, duck hunting, duck. The tail is usually held flat on the surface of the water, or held erect when defensive. Oceania. Diving Duck Foot Diving ducks inhabit large deep lakes and … A decline in bird numbers provides a warning that the natural ecological functioning of the freshwater system is at risk. The ruddy duck is a duck from North America and one of the stiff-tailed ducks. "A phylogenetic analysis of modern pochards (Anatidae: Aythyini)", "Winter field notes and specimen weights of Cayman Island Birds", "Nuevos registros para la avifauna de El Salvador", "New and Noteworthy Bird Records for Micronesia, 1986–2003", Lesser Scaup ‘’Aythya affinis’’ (Eyton, 1838), "Food habits of diving ducks in the Great Lakes after the zebra mussel invasion", The Nature Conservancy's Species profile for the Lesser Scaup, https://en.wikipedia.org/w/index.php?title=Lesser_scaup&oldid=968078782, Native birds of the Northwestern United States, Articles with unsourced statements from January 2016, Creative Commons Attribution-ShareAlike License, The occurrence of hybridization between lesser and greater scaup in the wild is disputed. After hatching, the young remain in the nest for 1 day, and are then led by the female from the nest. When the birds raise their heads, these differences are most easy to spot, and after observing the two species in direct comparison it usually becomes easy to recognize. From shop newtmcknz. Neotropical Birds. They launch themselves directly upward when taking off. Except for hybrids between the two scaup species, the most reliable mark is the black bill-tip of hybrids, whereas in the scaups only the very point ("nail") of the bill is black. The shy ruddy duck who conceals itself in cattails…the fast-flying canvasback… or the boisterous Canada goose. In the 1970s, the lesser scaup population was estimated at 6.9 million birds on average; in the 1990s it had declined to about half that number, and by the late 2000s it is estimated at 3 million individuals or less. see all. [6] Wing lengths (not wingspans) are about 7.5–7.9 in (19–20 cm) in males and 7.3–7.8 in (19–20 cm) in females; the tarsus is about 1.4–1.5 in (3.6–3.8 cm) long, and the bill 1.4–1.7 in (3.6–4.3 cm). Any long-term decrease in the population of waterbirds such as O. australis, which continue to breed yearlong, irrespective of drought conditions by seeking out suitable habitat, would make excellent indicators for wetland health. Incubation is by the female only and lasts around 3 weeks. They will also fly more frequently, probably due to the open habitat, and escape threats by flying. Show only. The chironomid larvae are quite common in inland cumbungi swamps, and therefore make up a large portion of the diet of O. australis during its breeding season. Hens vocalize more often than those of the greater scaup—particularly during flight—but their call is weaker, a guttural brrtt, brrtt.[2][7][8]. [6][7] Both result in smaller habitat sizes suitable to water birds. Male: Breeding male has greenish-black head, chestnut belly, white breast, yellow eyes and a black bill. [3][15], Before the start of the population decline (see below), about 57% of the lesser scaup nests failed each breeding season because the female was killed or the eggs were eaten or destroyed. Watch. Creature Profile Share Lesser scaup drakes in nuptial plumage are often said to be recognizable by the purple instead of green sheen of the head and a darker back. The drakes court the hens in the winter quarters; pairs form shortly before and during the spring migration. O. australis rarely appears on the New South Wales coastline except during times of drought. They mainly eat mollusks such as mussels and clams, as well as seeds and other parts of aquatic plants like sedges and bulrushes (Cyperaceae), "pondweeds", widgeon-grass (Ruppia cirrhosa), wild celery (Vallisneria americana) or wild rice (Zizania). With its beak the little bluebill or broadbill because of its distinctive blue bill CARRY-LITE MILWAUKEE/NORTH America duck Original. 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