Fowl arebirds belonging to one of twobiological orders, namely the gamefowl or landfowl (Galliformes) and the waterfowl (Anseriformes). Anatomical and molecular similarities suggest these two groups are closeevolutionary relatives; together, they form the fowlclade which is scientifically known asGalloanserae orGalloanseres (initially termed Galloanseri) (Latingallus ("rooster") +ānser ("goose")).[3] This clade is also supported by morphological andDNA sequence data[4] as well asretrotransposonpresence/absence data.[5]
As opposed to "fowl", "poultry" is a term for any kind ofdomesticated bird or bird captive-raised for meat, eggs, or feathers;ostriches, for example, are sometimes kept as poultry, but are neither gamefowl nor waterfowl. In colloquial speech, however, the term "fowl" is often used near-synonymously with "poultry", and many languages do not distinguish between "poultry" and "fowl". Nonetheless, the fact that the Galliformes and Anseriformes most likely form amonophyletic group makes a distinction between "fowl" and "poultry" warranted.
The historic difference in English is due to the Germanic/Latin split word pairs characteristic ofMiddle English; the word 'fowl' is of Germanic origin (cf. Old English "fugol", West Frisianfûgel, Dutchvogel, GermanVogel, Swedishfågel, Danish/Norwegianfugl), whilst 'poultry' is of Latinpullus ("chicken") viaNorman French originpoule ("chicken");[6][7] the presence of an initial /p/ inpoultry and an initial /f/ infowl is due toGrimm's Law.
Galloanserae are very prolific; they regularly produceclutches of more than five or even more than 10 eggs, which is a lot for such sizeable birds. By comparison,birds of prey andpigeons rarely lay more than two eggs.
While most living birds aremonogamous, at least for a breeding season, many Galloanserae are notoriouslypolygynous orpolyandrous. Toornithologists, this is particularly well known indabbling ducks, where the males band together occasionally to forcefully mate with unwilling females. The general public is probably most familiar with the polygynous habits ofdomestic chickens, where usually one or tworoosters are kept with a whole flock of females.
Hybridization is extremely frequent in the Galloanserae, andgenera, not usually known to produce viable hybrids in birds, can be brought to interbreed with comparative ease.Guineafowl have successfully produced hybrids with domestic fowl andIndian peafowl, to which they are not particularly closely related asGalliformes go. This is an important factor complicatingmtDNAsequence-based research on their relationships. Themallards ofNorth America, for example, are apparently mostly derived from some males which arrived fromSiberia, settled down, and mated withAmerican black duck ancestors.[8]See alsoGamebird hybrids.
Galloanserae young are remarkablyprecocious. Anseriform young are able to swim and dive a few hours after hatching, and the hatchlings ofmound-builders (megapodes) are fully feathered and even able to fly for prolonged distances as soon as they emerge from the nest mound.
From thefossils that have been recovered, the conclusion that the Galloanserae were already widespread by the end of theCretaceous is generally accepted. A combination of fossils andmolecular clocks estimated the origin of Galloanserae at 85 million years ago.[9] Fossils such asVegavis indicate that essentially modern waterfowl, albeit belonging to a now-extinct lineage, were contemporaries of the non-aviandinosaurs. While the dominantavialans of theMesozoic Era, theEnantiornithes, died out with all other non-avian dinosaurs, the Galloanserae (fowl) survived to become the first successful group of modern birds after the other dinosaurs died out.
As opposed to themorphologically fairly conservative Galliformes, the Anseriformes have adapted to filter-feeding and are characterized by manyautapomorphies related to this lifestyle. The extremely advanced feeding systems of the Anseriformes, together with similarities of the early anseriformPresbyornis toshorebirds, had formerly prompted some scientists to ally Anseriformes withCharadriiformes, instead.[10][11] However, as strong support for the Galloanserae has emerged in subsequent studies, the fowl clade continues to be accepted as a genuine evolutionary lineage by the vast majority of scientists.
Fowl have deep spiritual meanings and roots in ancient cultures, such as Hinduism in India and in many Pagan cultures throughout the world. The peacock, for example, represents truth, beauty, honor, and strength and dreams of peacocks are referred to as good omens.[12]
Fowl are frequently kept for both meat and eggs.Chickens, by far, are the most heavily consumed and farmed out of all of them. Other fowl commonly used in cooking includeducks,geese,turkeys andquail.
Various species of fowl are hunted for both sport and food.Pheasants have been widely introduced and naturalized outside of their native range in Asia to Europe and North America for use as food and sport.[13]
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