flock of swans, black and white types on the frozen danube river, in zemun, belgrade, serbia

2017 afternoon anatidae animal are balkan beak belgrade beograd bird birds blizzard cold cube cygnus danube duck dunav environment europe european fauna flock freeze frost frozen group herd ice iceberg iced kej nature panorama particularly plumage polar popping provoking river riverspicture season serbia serbian snow srbija sunny swan swans taken total typical water waterscape white wildlife winter zemun zemunski