Because they don`t live in the sea.
All swans live on freshwater, and eat vegetation on the bottom.
they are calm
The habitats favoured by swans vary with species, but they are often found on rivers and streams, particularly slower flowing ones. They also frequent lakes.
Swans fly, usually in pairs. Swans mate for life. They often settle in one area and return to it year after year. But the short answer is, people don't have to "put" them there. They fly.
110 year
Because they live in the snow.
They can live up to 50 years.
yes
Ponds, lakes, slow-going rivers and freshwater marshes.
Ponds, lakes, slow-going rivers and freshwater marshes.
they live in parts of Europe and North America!
Because they live in the snow.