• canadensis (I) Red-breasted goose (Rothalsgans), Branta ruficollis Mute swan (Höckerschwan), Cygnus olor Black swan (Schwarzschwan), Cygnus atratus (I) Whooper...
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    [PDF; retrieved on October 18, 2022]).↵ Here p. 237. Gerald Mayer: Der Höckerschwan (Cygnus olor) in Oberösterreich. In: Monticola. Volume 2. Linz 1969,...
    30 KB (3,888 words) - 19:26, 15 May 2024