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Their feathers are excellent at shedding water due to special oils. Many of the ducks display sexual dimorphism, with the males being more brightly coloured than the females (although the situation is reversed in species such as the paradise shelduck). The swans, geese, and whistling-ducks lack sexually dimorphic plumage.
Depictions of swans (genus Cygnus) in art. The swans' closest relatives include the geese and ducks . Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini .
Swans' nests are on the ground near water and about a metre (3') across. Unlike many other ducks and geese, the male helps with the nest construction, and will also take turns incubating the eggs. [26] Alongside the whistling ducks, swans are the only anatids that will do this.
Hamsa is thought to refer to the bar-headed goose found in India (left) or a species of swan. [1]The haṃsa (Sanskrit: हंस haṃsa or hansa) is an aquatic migratory bird, referred to in ancient Sanskrit texts which various scholars have interpreted as being based on the goose, the swan, [2] or even the flamingo.
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.
Trumpeter swan: Cygnus buccinator Richardson, 1831: 32 Tundra swan: Cygnus columbianus (Ord, 1815) 33 Whooper swan: Cygnus cygnus (Linnaeus, 1758) 34 Freckled duck: Stictonetta naevosa (Gould, 1841) 35 Blue duck: Hymenolaimus malacorhynchos (Gmelin, JF, 1789) 36 Flying steamer duck: Tachyeres patachonicus (King, PP, 1831) 37 Fuegian steamer duck
The swans' closest relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. There are six living and many extinct species of swan; in addition, there is a species known as the coscoroba swan which is no longer considered one of the true swans.
The Anserinae are a subfamily in the waterfowl family Anatidae.It includes the swans and the true geese.Under alternative systematical concepts (see e.g., Terres & NAS, 1991), it is split into two subfamilies, the Anserinae contain the geese and the ducks, while the Cygninae contain the swans.