Paired geese are more dominant and feed more, two factors that result in more young. Geese are monogamous, living in permanent pairs throughout the year however, unlike most other permanently monogamous animals, they are territorial only during the short nesting season. In addition, some goose-like birds are known from subfossil remains found on the Hawaiian Islands. The aptly named Anser atavus (meaning "progenitor goose") from some 12 million years ago had even more plesiomorphies in common with swans. Either these or, more probably, the goose-like Coscoroba swan is the closest living relative of the true geese.įossils of true geese are hard to assign to genus all that can be said is that their fossil record, particularly in North America, is dense and comprehensively documents many different species of true geese that have been around since about 10 million years ago in the Miocene. The Total Size Of The Downloadable Vector File Is 0. Two genera of "geese" are only tentatively placed in the Anserinae they may belong to the shelducks or form a subfamily on their own: Cereopsis, the Cape Barren goose, and Cnemiornis, the prehistoric New Zealand goose. Download The Grey Goose Logo Vector File In Eps, PNG Format (Encapsulated PostScript). The three living genera of true geese are: Anser, grey geese, including the greylag goose, and domestic geese Chen, white geese (often included in Anser) and Branta, black geese, such as the Canada goose. More distantly related members of the family Anatidae are swans, most of which are larger than true geese, and ducks, which are smaller. Some other birds, mostly related to the shelducks, have "goose" as part of their names. Chen, a genus comprising 'white geese', is sometimes used to refer to a group of species that are more commonly placed within Anser. This group comprises the genera Anser (the grey geese) and Branta (the black geese). Geese are waterfowl of the family Anatidae.
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