Introduction of swan

Cygnus (scientific name: Cygnus) is a genus of Anatidae. The bird of this genus is the largest species of swimming birds, also known as Siniperca chuatsi or Siniperca chuatsi, commonly known as "swan".

Swan has wild species or subspecies on all continents except Africa. Four kinds of white swans are distributed in the northern hemisphere, collectively known as white swans or northern swans. Black swan is distributed in Australia and other places in the southern hemisphere, and black-necked swan is distributed in South America. Together with another kind of flat-billed goose, they are called southern swans.

Swan birds are hermaphroditic, and females are slightly smaller than males. Swan has a large body and a slender neck, and the beak color of different species is obviously different. Some swans, such as the wart-nosed swan and the black-necked swan, have obvious protrusions at the bottom of their beaks. The yellow and black beaks of the big swan and the little swan will also change at different ages. Swan's body is oval, with two pointed ends, short legs and black feet.

Birds of this genus have obvious color characteristics, except black swan and black-necked swan, all other species are white. The feathers of adult birds are dim, and the color of their mouths is not as bright as that of adult birds. Young birds have grayish brown feathers, commonly known as ugly ducklings.

Extended data:

Major species—

1, cygnus

Alias mandarin fish (ancient name), cough swan and white goose (the names of Hebei, Inner Mongolia and Southeast Asia). Black and white; The macula on both sides of the floor of the mouth extends forward along the edge of the mouth under the nostril; The neck is slender and often straight on the water. The overall proportion of the body is larger than that of the cygnet.

2.cygnus, cygnus

Alias short-billed swan, white goose and feeding goose (south name, north name). The wintering period is in the Yangtze River valley and the southeast coast of China. Abroad, it breeds in the northernmost part of Eurasia and North America; Wintering in Central Europe, Asia and America. The body feathers are white, slightly smaller than the big swan. The macula on both sides of the floor of the mouth does not extend forward along the edge of the mouth to the underside of the nostril. In the wild, it is very similar to the big swan, with a straight neck and a short neck and mouth.

3. A swan with a wart on its nose? Cygnus

Alias: Asian Swan, Red-billed Swan and White Goose

Distribution: It breeds in north-central Xinjiang, Qaidam Basin in Qinghai, Weak Water in Northwest Gansu and Wuliangsuhai in Inner Mongolia. Wandering in Northeast China, Shandong and Hebei; Overwintering in the middle and lower reaches of the Yangtze River; It was found in Taiwan Province Province as a missing bird. The figure and feather color are similar to those of the big swan. The mouth is reddish and there is a black wart on the forehead, which is obviously different from the other two swans.

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