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Cygnus olor Oulunsalo . region FI en Mute Swans Cygnus olor at Akionlahti bay in Oulunsalo Finland fi Kyhmyjoutsenia Cygnus olor Akionlahdella Oulunsalossa own Estormiz cczero Birds of Oulu Cygnus olor swimming pairs in May May in Finland Salonp Oulu Taken with Canon EOS Uploaded with Cygnus olor in Finland