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Anser is a waterfowl genus that includes the grey geese and the white geese.It belongs to the true goose and swan subfamily of Anserinae under the family of Anatidae. [2] The genus has a Holarctic distribution, with at least one species breeding in any open, wet habitats in the subarctic and cool temperate regions of the Northern Hemisphere in summer.
The greater white-fronted goose (Anser albifrons) is a species of goose, closely related to the smaller lesser white-fronted goose (A. erythropus). [2] The greater white-fronted goose is migratory , breeding in northern Canada , Alaska , Greenland and Russia, and winters farther south in North America, Europe and Asia. [ 1 ]
A small flock of Pilgrim Geese - an example of color-sexing goose; males are white, females are gray The plumage of male and female goose is usually the same. However, there are few auto-sexing goose, which are sexually dimorphic and the sex can be identified by the first look by plumage.
The bird is pale grey and is easily distinguished from any of the other grey geese of the genus Anser by the black bars on its head. It is also much paler than the other geese in this genus. In flight, its call is a typical goose honking. A mid-sized goose, it measures 71–76 cm (28–30 in) in total length and weighs 1.87–3.2 kg (4.1–7.1 lb).
This group comprises the genera Anser (grey geese and white geese) and Branta (black geese). Some members of the Tadorninae subfamily (e.g., Egyptian goose, Orinoco goose) are commonly called geese, but are not considered "true geese" taxonomically.
Genus Anser – grey and white geese; Genus Branta – black geese; Unresolved. Genus Coscoroba – coscoroba swan; These two genera are distinct from other geese and often elevated to a subfamily of their own (Cereopsinae), or alternatively into the shelduck subfamily Tadorninae: Tribe Cereopseini. Genus Cereopsis – Cape Barren goose
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The greylag goose was one of the first animals to be domesticated; this happened at least 3,000 years ago in Ancient Egypt, the domestic subspecies being known as A. a. domesticus. [7] As the domestic goose is a subspecies of the greylag goose they are able to interbreed, with the offspring sharing characteristics of both wild and domestic ...