# the swans play 110 million times
The swans (academic name: cygnus olor, alias: anas olor) and the swans (silent and low-silent) are a large game bird of the swans. Life expectancy in a wild state is up to 19 years; life expectancy in a breeding state is 30 to 40 years. It is one of the largest swans in the individual, with a size of 130 ~ 158 cm, a weight of 7 ~ 10 kg and a wingspan of 2 ~ 2. 5 m. Adults are white in their bodies and sometimes their heads and necks are brown because of iron-containing water and mud; their mouths are red; their tails are long and pointy; and they are gills, gills and claws black. Females have the same individual feathers, but the female is smaller, the male has a black argon in the forehead and the female is not visible. They appear in pairs of courtships, and the neck bends in love. Nasal swans breed in northern europe, eastern europe, western asia, east asia, such as sweden, poland, iran, mongolia and china, and in africa, the mediterranean, the black sea, south asia (india), east asia (japan, north korea, china). It often operates on open water, at night on the quieter lake core islands, on floating matter and on dry reeds (phragmites australis), and in ports and artificial water bodies. On 5 february 2021, swans were included in china's national list of priority wildlife protection, protecting animals for secondary wildlife. Its feathers can be used as quills, leather as purses, wings as whistles, and in the united kingdom as domesticated for food. In china, the swans are better “environmental assessors”, demanding the quality of the living environment, and are used as an indicator species of the ecological environment, which some zoos also display as pearls of value。
