Why do swans have feathers for?

* Protection: Feathers provide insulation and protection from the elements, such as cold, wind, and rain.

* Flight: Feathers are essential for flight, as they provide lift and drag.

* Buoyancy: Feathers help swans to stay afloat in water.

* Display: Feathers are used for display purposes, such as attracting mates and defending territory.

* Communication: Feathers can also be used for communication, such as signalling danger or indicating their mood.