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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.
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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").
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]
Fowl are birds belonging to one of two biological orders, namely the gamefowl or landfowl (Galliformes) and the waterfowl (Anseriformes).Anatomical and molecular similarities suggest these two groups are close evolutionary relatives; together, they form the fowl clade which is scientifically known as Galloanserae or Galloanseres (initially termed Galloanseri) (Latin gallus ("rooster") + ānser ...
The genus belongs to the family Anatidae in the waterfowl order Anseriformes. They were formerly placed in the "perching ducks", a paraphyletic group somewhat intermediate between shelducks and dabbling ducks, and it is not quite clear whether they should be placed in the Anatinae (dabbling duck) or Tadorninae (shelduck) subfamily. [2] [3]
This classification is found by a relative apparent synapomorphy analysis (RASA) which highlighted certain branches of genes that classified the domestic duck and fowl, for example, as an outgroup. Comparing and understanding these gene patterns allows scientists to classify aquatic birds.