They are graceful and pleasant. They are related to geese and ducks. South American swans have black necks.
Australian swans are all black.
I think that is a little weird. The swans that live here either have black feet and beaks or orange feet or beaks. Swans are usually born in the Arctic tundra. A swan's wings are waterproof for cold waters up in the Arctic tundra. They keep warm because their feathers trap the air.