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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").
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 ...
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.
Duck is the common name for numerous species of waterfowl in the family Anatidae. Ducks are generally smaller and shorter-necked than swans and geese , which are members of the same family. Divided among several subfamilies, they are a form taxon ; they do not represent a monophyletic group (the group of all descendants of a single common ...
Through March 2021, Ducks Unlimited had conserved at least 15 million acres [6] of waterfowl habitat in North America. [ 7 ] To promote the conservation of waterbirds in America, the United States Fish and Wildlife Service established the Waterbird Conservation for the Americas to facilitate this over such a large area.
This is a list of Anseriformes species by global population. While numbers are estimates, they have been made by the experts in their fields. Anseriformes (Anser being Latin for "goose") is the taxonomic order to which the ducks, geese, swans, and screamers belong.
[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.
As the "perching ducks" are a paraphyletic group, [2] they need to be placed elsewhere. The initially assumed relationship with the dabbling duck subfamily Anatinae [ citation needed ] has been questioned, and it appears they form a lineage in an ancient Gondwanan radiation of waterfowl, within which they are of unclear affinities. [ 3 ]