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Prize-winning Aylesbury duck (front) and drake (rear), 1873. The Aylesbury duck is a breed of domesticated duck, bred mainly for its meat and appearance.It is a large duck with pure white plumage, a pink bill, orange legs and feet, an unusually large keel, and a horizontal stance with its body parallel to the ground.
This is a list of the bird species recorded in England.The avifauna of England include a total of 625 species, of which 14 have been introduced by humans.. This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) follow the conventions of British Ornithologists' Union (BOU).
Sometimes, journeys are not termed "true migration" because they are irregular (nomadism, invasions, irruptions) or in only one direction (dispersal, movement of young away from natal area). Non-migratory birds are said to be resident or sedentary. Approximately 1,800 of the world's 10,000 bird species are long-distance migrants. [14] [15]
The swans, ducks and geese are medium to large birds that are adapted to an aquatic existence with webbed feet and bills which are flattened to a greater or lesser extent. In many ducks the male is colourful while the female is dull brown. The diet consists of a variety of animals and plants.
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.
The Eurasian teal (Anas crecca), common teal, or Eurasian green-winged teal is a common and widespread duck that breeds in temperate Eurosiberia and migrates south in winter. [2] The Eurasian teal is often called simply the teal due to being the only one of these small dabbling ducks in much of its range. [3]
The long period of evolution and shifts from one kind of waterbird lifestyle to another have obscured many plesiomorphies, while apparent apomorphies are quite often the result of parallel evolution, for example the "non-diving duck" type displayed by such unrelated genera as Dendrocygna, Amazonetta, and Cairina. For the fossil record, see below.
Ducks generally only have one partner at a time, although the partnership usually only lasts one year. [26] Larger species and the more sedentary species (like fast-river specialists) tend to have pair-bonds that last numerous years. [27] Most duck species breed once a year, choosing to do so in favourable conditions (spring/summer or wet seasons).