No
All swans live on freshwater, and eat vegetation on the bottom.
NOW
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.
Because they live in the snow.
yes
They can live up to 50 years.
110 year
they live in parts of Europe and North America!
Because they live in the snow.
Because they don`t live in the sea.
yes