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[2] [4] The peculiar marbled duck, formerly tentatively assigned to the dabbling ducks, is thought to be a diving duck or even a distinct subfamily. [ 2 ] This group of ducks has been so named because its members feed mainly on vegetable matter by upending on the water surface, or grazing, and only rarely diving.
The avian family Anatidae, commonly called waterfowl, comprise the ducks, geese, and swans. The International Ornithological Committee (IOC) recognizes these 174 Anatidae species distributed among 53 genera, 32 of which have only one species.
Geese and ducks are just two types of water birds, which include seabirds, shorebirds, waterfowl, and numerous other forms of birds. Video of gulls, ducks, and swans feeding on the Danube River in Vienna (2014) A water bird, alternatively waterbird or aquatic bird, is a bird that lives on or around water.
Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which includes over 170 species of waterfowl, among them the ducks, geese, and swans. Most modern species in the ...
While shortcomings certainly occur in Livezey's analysis, [citation needed] mtDNA is an unreliable source for phylogenetic information in many waterfowl (especially dabbling ducks) due to their ability to produce fertile hybrids, [2] in rare cases possibly even beyond the level of genus (see for example the "Barbary duck").
The North American Waterfowl Management Plan for redheads is 760,000 North American birds. [13] The population size has increased in the past few decades to well over 1.4 million birds. [6] Redheads make up 2% of North America's duck population and only 1% of its harvested ducks. [13]
This is the largest of the steamer duck species. It is a massively built waterfowl at 3.5–7 kg (7.7–15.4 lb) and 65–84 cm (26–33 in) in length, with the males noticeably larger than the females. [2] Males weigh an average of 5.34 kg (11.8 lb) while females weigh around 4.2 kg (9.3 lb) on average. [3]
The greater scaup (Aythya marila), just scaup in Europe or, colloquially, "bluebill" in North America, [3] is a mid-sized diving duck, larger than the closely related lesser scaup and tufted duck. It spends the summer months breeding in Iceland , east across Scandinavia , northern Russia and Siberia , Alaska , and northern Canada .