Close up of a black-necked swan scratching its head with its palmate foot while floating on a lake

pond behavior lagoon feathers head swim palmate exoticism flock black white lake peaceful feet swan bird float wild waterfowl bill habitat looking delicate migration water blacknecked wilderness palmation natural vegetation cygnus native coverts nature searching aquatic sink food migratory environment wings specie fauna beak plumage melancoryphus neck south american underwater