Dumb swan [4] (Cygnus Olor) - a species of a large, partially migratory water bird from the subfamily of geese (Anserinae) in a non-smoking family (Anatidae). He inhabits Eurasia from Great Britain and France to Pacific. Flights: February-May and September-December. He clues in Europe, in the Middle East, Central and East Asia, rarely in North Africa and Pakistan [5]. Introduced, among others In North America [6], Australia, New Zealand [5] [7]. In Poland, a few, locally medium numerous; The Polish population mostly takes short-distance bolts. There are no subspecies [5] [8]. He is one of the heaviest flying birds.
