Adult whooper swan (Cygnus cygnus), pair on nest near Lake Myvatn, Iceland

whooper swan cygnus nest lake pair iceland adult swans nesting season wildlife nature birds waterfowl habitat reproduction animal behavior flora avian migration breeding environment wetlands scenic courtship eggs nests ecology feathers tranquility grass marshland outdoor avifauna landscape kingdom family structure lakeshore natural birdwatching peace conservation species couple nurturing peacefulness icelandic