The swan is a large bird and a large swimming bird, with a body length of about 1.5m and a weight of more than 10kg. The plumage is white, the mouth is mostly black, and the upper mouth to the nostrils is yellow. Their necks are long, about half their body length.

At present, there are five species of swans in the world, namely the whooper swan, the little swan, the mute swan, the black swan, and the black-necked swan. Among them, except for black swans distributed in Oceania and black-necked swans distributed in South America, the other three are distributed all over the world.

The sexual maturity of swans is 3 to 4 years, and they breed once a year after sexual maturity. The breeding season mainly inhabits open lakes, ponds, and swamps, and in winter it mainly inhabits large lakes and reservoirs with many reeds.

Swans often swim with their necks outstretched and their wings pressed against each other. Because of their graceful posture, swans have been the embodiment of beauty and grace throughout the ages.

Swans maintain a rare "mate for life". During wintering, they both feed and rest in pairs. While the female swans are laying eggs, the male swans stand beside them. When it encounters an enemy, it flaps its wings to meet the enemy and fights bravely.

Not only do they help each other during the breeding season, but they also usually come in pairs, and if one dies, the other will live alone for life.

There are black swans and black-necked swans in the southern hemisphere. Swans are graceful in shape, with long necks, solid bodies, and large feet. They are solemn when gliding in the water.

When flying, they stretch their long necks and flap their wings slowly. When flying over the winter, they form a diagonal or "human"-shaped queue at a high altitude. Other waterfowl are not as fast as swans, either in water or in the air.

The evening is the peak period of foraging for swans. The swans are in groups, sometimes rejoicing in the lake, sometimes hitting the water and soaring into the sky. Under the sun, swans, lakes, mountain peaks, and cloud shadows blend together, which is extremely spectacular. At this time, the swans danced an elegant and moving "water ballet" in the lake.

They sometimes catch grass stems floating on the water, sometimes squatting into the grass to search for delicate fresh leaves, bend and twist their necks, and draw smooth arcs from time to time.

The swan is an auspicious bird in the hearts of people of all ethnic groups in the world. It is known as a symbol of beauty, purity, nobility, elegance, loyalty, festival, and bravery. It is a precious animal with high aesthetic and cultural value and is deeply loved and praised.