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Geese, Anser, Branta 

Canada geese.
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Geese are waterfowl belonging to the tribe Anserini of the family Anatidae. This tribe comprises the genera Anser (bird) (the grey geese), Branta (the black geese) and Chen (the white geese). A number of other birds, mostly related to the shelducks, have "goose" as part of their name. More distantly related members of the Anatidae family are swans, most of which are larger than true geese, and ducks, which are smaller.

The waterfowl genus Anser includes all grey geese and sometimes the white geese. It belongs to the true geese and swan subfamily, Anserinae. 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. Some also breed further south, reaching into warm temperate regions. They mostly migrate south in winter, typically to regions in the temperate zone between the January 0 °C to 5 °C isotherms.

The genus contains ten living species, which span nearly the whole range of true goose shapes and sizes. The largest is the Greylag Goose at 2.5–4.1 kg weight, and the smallest is the Ross's Goose at 1.2–1.6 kg . All have legs and feet that are pink, or orange, and bills that are pink, orange, or black. All have white under- and upper-tail coverts, and several have some extent of white on their heads. The neck, body and wings are grey or white, with black or blackish primary—and also often secondary—remiges (pinions). The closely related "black" geese in the genus Branta differ in having black legs, and generally darker body plumage.

The black geese of the genus Branta are waterfowl belonging to the true geese and swans subfamily Anserinae. They occur in the northern coastal regions of the Palearctic and all over North America, migrating to more southernly coasts in winter, and as resident birds in the Hawaiian Islands. Alone in the Southern Hemisphere, a self-sustaining feral population derived from introduced birds of one species is also found in New Zealand.

The black geese derive their vernacular name for the prominent areas of black coloration found in all species. They can be distinguished from all other true geese by their legs and feet, which are black or very dark grey. Furthermore, they have black bills and large areas of black on the head and neck, with white (ochre in one species) markings that can be used to tell apart most species.[note 1] As with most geese, their undertail and uppertail coverts are white. They are also on average smaller than other geese, though some very large taxa are known, which rival the Swan Goose and the Black-necked Swan in size.

The Eurasian species of black geese have a more coastal distribution compared to the grey geese which share the same general area of occurrence, not being found far inland even in winter (except for occasional stray birds or individuals escaped from captivity). This does not hold true for the American and Pacific species, in whose ranges grey geese are for the most part absent.

Alphabeticl list of geese

Engelsk Norsk Latinsk
Andean Goose Andesgås Chloephaga melanoptera
Ashy-headed Goose Gråhodegås Chloephaga poliocephala
Bar-headed Goose Stripegås Anser indicus
Barnacle Goose
Aleutan Can. Goose
Hvitkinngås Branta leucopsis
Branta min. leucopareia
Blue-winged Goose Blåvingegås Cyanochen cyanoptera
Black Brant
Pacific Brant Goose
Ringgås Branta bernicla
Branta bernicla nigricans
Cackling Goose Polargås Branta hutchinsii
Canada Goose Kanadagås Branta canadensis
Cape Barren Goose Hønsegås Cereopsis novaehollandiae
Emperor Goose Keisergås Chen canagica
Eurasian Griffon Gåsegribb Gyps fulvus
Greater White-fronted Goose Tundragås Anser albifrons
Greylag Goose Grågås Anser anser
Hawaiian Goose Hawaiigås Branta sandvicensis
Kelp Goose Taregås Chloephaga hybrida
Lesser White-fronted Goose Dverggås Anser erythropus
Magpie Goose Skjæregås Anseranas semipalmata
Orinoco Goose Amazongås Neochen jubata
Pink-footed Goose Kortnebbgås Anser brachyrhynchus
Red-breasted Goose Rødhalsgås Branta ruficollis
Ross' Goose Eskimogås Chen rossii
Ruddy-headed Goose Brunhodegås Chloephaga rubidiceps
Snow Goose Snøgås Chen caerulescens
Spur-winged Goose Sporegås Plectropterus gambensis
Swan Goose Svanegås Anser cygnoides
Bean Goose
Taiga Bean-Goose
Sædgås Anser fabalis
Tundra Bean-Goose Tundrasædgås Anser serrirostris
Upland Goose Sebragås Chloephaga picta


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