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Subfamily: Anserinae, swans and geese (3–7 extant genera with 25–30 living species, mainly cool temperate Northern Hemisphere, but also some Southern Hemisphere species, with the swans in one genus [two genera in some treatments], and the geese in three genera [two genera in some treatments].
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 word "goose" is a direct descendant of Proto-Indo-European *ǵʰh₂éns.In Germanic languages, the root gave Old English gōs with the plural gēs and gandra (becoming Modern English goose, geese, gander, respectively), West Frisian goes, gies and guoske, Dutch: gans, ganzen, ganzerik, New High German Gans, Gänse, and Ganter, and Old Norse gás and gæslingr, whence English gosling.
Anseriformes is an order of birds also known as waterfowl that comprises about 180 living species of birds in three families: Anhimidae (three species of screamers), Anseranatidae (the magpie goose), and Anatidae, the largest family, which includes over 170 species of waterfowl, among them the ducks, geese, and swans.
The ruddy-headed goose is 45 to 52.5 cm (18 to 21 in) long. Males weigh 1.65 to 2.02 kg (3.6 to 4.5 lb) and females 1.20 to 1.50 kg (2.6 to 3.3 lb). Adults have the same plumage. Their heads and necks are red-brown, their back, breast, and flanks gray and buff with brown barring, their belly cinnamon, and their tail black.
Head of a white Chinese goose A flock of Emden geese A flock of Twente geese Öland goose in pond. One of about 100 in existence. Adler goose (Адлерская) [3] [4] African goose [1] [3] [5] Alsatian goose (Oie d'Alsace) [3] [5] American buff goose [1] [5] Amorstream goose [3] Anhui goose [3] Aonghus goose; Arzamas goose ...
Genus †Megalodytes (Miocene of California) True geese (Tribe Anserini) 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 ...
A cladistic study of the morphology of waterfowl found that the magpie goose was an early and distinctive offshoot, diverging after screamers and before all other ducks, geese and swans. [ 2 ] This family is quite old, a living fossil , having apparently diverged before the Cretaceous–Paleogene extinction event – the relative Vegavis iaai ...